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Hog Island — September 12, 2026

Hog Island — September 12, 2026

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Reference: Hog Island · 2026-09-12

Group: Apparent horizon with inferior miraging

The camera is positioned 7 feet above the water’s surface. These observations zoom in on the shoreline three miles away. The boat is 0.68 miles away.

Weather & River Conditions

Historical · modeled air / NOAA river · nearby, not on-site

Historical context, not on-site measurements. Camera: 39°51′35.9″N, 75°16′47.0″W (project observation location). Air: Open-Meteo archive gridded model, not a station observation. River: nearby NOAA Philadelphia station 8545240, not the Hog Island camera site. River heights use MLLW; predicted tides are not observed water levels. Observed NOAA water levels may be preliminary (q=p), not final verified station data; quality codes and flags are preserved in the cache. All times America/New_York (NOAA local daylight time). Missing values remain unavailable. No ocean-wave or swell inference.

2026-09-12Approx. 11:40 AM ETRising tide predicted
Air · model
79.2 °F
Water
81 °F
Wind
6.4 mph
River
3.957 ft MLLW
Details & sources

Illustrative near-capture comparison at 11:40:22: median embedded still-photo clock; America/New_York assumed, camera clock/timezone not verified. Not a confirmed simultaneous measurement. Model grid returned: 39.89455, -75.31381. NOAA Philadelphia station: 39.9331, −75.1420 (upstream); nearby context can differ from the camera site.

Air temperature
79.2 °F
Modeled · Open-Meteo grid · 2026-09-12T12:00
Water temperature
81 °F
Observed · NOAA Philadelphia 8545240 · 2026-09-12 11:42
Wind
6.4 mph
Modeled · hourly grid
Gust
17 mph
Modeled · hourly grid
Direction
145 ° true
Modeled · hourly grid
Humidity
57 %
Modeled · hourly grid
Dew point
62.6 °F
Modeled · hourly grid
Surface pressure
1019.3 hPa
Modeled · hourly grid
Cloud
63 %
Modeled · hourly grid
Precipitation
0 in
Modeled · hourly grid
River level
3.957 ft MLLW
Observed · Philadelphia · 2026-09-12 11:42 · verified
Visibility
Unavailable
Unavailable · archive does not provide visibility

Daily summary · modeled air / astronomical sunrise and sunset: Air low: 62.4 °F; Air high: 82.1 °F; Daily precipitation: 0.051 in; Sunrise: 2026-09-12T06:39; Sunset: 2026-09-12T19:14; Water temperature observed sample range: 81–81.3 °F (240 samples); River level observed sample range: 0.538–7.848 ft MLLW (240 samples)

Predicted tides · NOAA Philadelphia 8545240 · ft MLLW: High 2026-09-12 02:43 · 6.98 ft MLLW; Low 2026-09-12 09:38 · 0.451 ft MLLW; High 2026-09-12 15:10 · 6.876 ft MLLW; Low 2026-09-12 21:59 · 0.654 ft MLLW

Hourly modeled atmosphere (24 hours)
Local timeAir temperature (°F)Wind (mph)Gust (mph)Direction (° true)Humidity (%)Dew point (°F)Surface pressure (hPa)Cloud (%)Precipitation (in)
2026-09-12T00:0067.32.262527960.51017.920
2026-09-12T01:0066.61.53.62618060.4101800
2026-09-12T02:0063.21.62.93358859.71018.100
2026-09-12T03:0063.22.241889601017.800
2026-09-12T04:00631.33.8599060.11018.150
2026-09-12T05:0062.71.22419260.31018.5590
2026-09-12T06:0062.42.44.3319360.41018.5930
2026-09-12T07:0062.73.76599360.61019.2760
2026-09-12T08:0064.8410.3619061.91019.7980
2026-09-12T09:0068.53.810.5767861.31019.6930
2026-09-12T10:0072.43.711.2956961.51019.6970
2026-09-12T11:0075.95.214.31316563.31019.7800
2026-09-12T12:0079.26.4171455762.61019.3630
2026-09-12T13:0081.78.320.41625061.11018.6510
2026-09-12T14:00827.720.61645061.31018.41000
2026-09-12T15:0082.1718.31675061.61017.9990
2026-09-12T16:0081.89.120.61645161.91017.41000
2026-09-12T17:0079.99.121.91585461.610171000
2026-09-12T18:0078.29.322.61545761.71016.6990
2026-09-12T19:0075.66.619.914363621016.9960
2026-09-12T20:0073.57.313.41467063.11017.9990
2026-09-12T21:0070.36.214.312786661017.9960.031
2026-09-12T22:0069.95.610.7989167.11017.4950.02
2026-09-12T23:0069.4611959166.71016.9970
Observed river samples (480)
ProductLocal timeValue
Water temperature2026-09-12 00:0081.1 °F
Water temperature2026-09-12 00:0681.1 °F
Water temperature2026-09-12 00:1281.1 °F
Water temperature2026-09-12 00:1881.1 °F
Water temperature2026-09-12 00:2481.1 °F
Water temperature2026-09-12 00:3081.1 °F
Water temperature2026-09-12 00:3681.1 °F
Water temperature2026-09-12 00:4281.1 °F
Water temperature2026-09-12 00:4881.1 °F
Water temperature2026-09-12 00:5481.1 °F
Water temperature2026-09-12 01:0081.1 °F
Water temperature2026-09-12 01:0681.1 °F
Water temperature2026-09-12 01:1281.1 °F
Water temperature2026-09-12 01:1881.1 °F
Water temperature2026-09-12 01:2481.1 °F
Water temperature2026-09-12 01:3081.1 °F
Water temperature2026-09-12 01:3681 °F
Water temperature2026-09-12 01:4281 °F
Water temperature2026-09-12 01:4881 °F
Water temperature2026-09-12 01:5481 °F
Water temperature2026-09-12 02:0081 °F
Water temperature2026-09-12 02:0681 °F
Water temperature2026-09-12 02:1281 °F
Water temperature2026-09-12 02:1881 °F
Water temperature2026-09-12 02:2481 °F
Water temperature2026-09-12 02:3081 °F
Water temperature2026-09-12 02:3681 °F
Water temperature2026-09-12 02:4281 °F
Water temperature2026-09-12 02:4881 °F
Water temperature2026-09-12 02:5481 °F
Water temperature2026-09-12 03:0081 °F
Water temperature2026-09-12 03:0681 °F
Water temperature2026-09-12 03:1281 °F
Water temperature2026-09-12 03:1881 °F
Water temperature2026-09-12 03:2481 °F
Water temperature2026-09-12 03:3081 °F
Water temperature2026-09-12 03:3681 °F
Water temperature2026-09-12 03:4281 °F
Water temperature2026-09-12 03:4881 °F
Water temperature2026-09-12 03:5481 °F
Water temperature2026-09-12 04:0081 °F
Water temperature2026-09-12 04:0681 °F
Water temperature2026-09-12 04:1281 °F
Water temperature2026-09-12 04:1881 °F
Water temperature2026-09-12 04:2481 °F
Water temperature2026-09-12 04:3081 °F
Water temperature2026-09-12 04:3681 °F
Water temperature2026-09-12 04:4281 °F
Water temperature2026-09-12 04:4881 °F
Water temperature2026-09-12 04:5481 °F
Water temperature2026-09-12 05:0081 °F
Water temperature2026-09-12 05:0681 °F
Water temperature2026-09-12 05:1281 °F
Water temperature2026-09-12 05:1881 °F
Water temperature2026-09-12 05:2481 °F
Water temperature2026-09-12 05:3081 °F
Water temperature2026-09-12 05:3681.1 °F
Water temperature2026-09-12 05:4281.1 °F
Water temperature2026-09-12 05:4881.1 °F
Water temperature2026-09-12 05:5481.1 °F
Water temperature2026-09-12 06:0081.1 °F
Water temperature2026-09-12 06:0681.1 °F
Water temperature2026-09-12 06:1281.1 °F
Water temperature2026-09-12 06:1881.1 °F
Water temperature2026-09-12 06:2481.1 °F
Water temperature2026-09-12 06:3081.1 °F
Water temperature2026-09-12 06:3681.1 °F
Water temperature2026-09-12 06:4281.1 °F
Water temperature2026-09-12 06:4881.1 °F
Water temperature2026-09-12 06:5481.1 °F
Water temperature2026-09-12 07:0081.1 °F
Water temperature2026-09-12 07:0681.1 °F
Water temperature2026-09-12 07:1281.1 °F
Water temperature2026-09-12 07:1881.1 °F
Water temperature2026-09-12 07:2481.1 °F
Water temperature2026-09-12 07:3081.1 °F
Water temperature2026-09-12 07:3681.1 °F
Water temperature2026-09-12 07:4281.1 °F
Water temperature2026-09-12 07:4881.1 °F
Water temperature2026-09-12 07:5481.1 °F
Water temperature2026-09-12 08:0081 °F
Water temperature2026-09-12 08:0681 °F
Water temperature2026-09-12 08:1281 °F
Water temperature2026-09-12 08:1881 °F
Water temperature2026-09-12 08:2481 °F
Water temperature2026-09-12 08:3081 °F
Water temperature2026-09-12 08:3681 °F
Water temperature2026-09-12 08:4281 °F
Water temperature2026-09-12 08:4881 °F
Water temperature2026-09-12 08:5481 °F
Water temperature2026-09-12 09:0081 °F
Water temperature2026-09-12 09:0681 °F
Water temperature2026-09-12 09:1281 °F
Water temperature2026-09-12 09:1881 °F
Water temperature2026-09-12 09:2481 °F
Water temperature2026-09-12 09:3081 °F
Water temperature2026-09-12 09:3681 °F
Water temperature2026-09-12 09:4281 °F
Water temperature2026-09-12 09:4881 °F
Water temperature2026-09-12 09:5481 °F
Water temperature2026-09-12 10:0081 °F
Water temperature2026-09-12 10:0681 °F
Water temperature2026-09-12 10:1281 °F
Water temperature2026-09-12 10:1881 °F
Water temperature2026-09-12 10:2481 °F
Water temperature2026-09-12 10:3081 °F
Water temperature2026-09-12 10:3681 °F
Water temperature2026-09-12 10:4281 °F
Water temperature2026-09-12 10:4881 °F
Water temperature2026-09-12 10:5481 °F
Water temperature2026-09-12 11:0081 °F
Water temperature2026-09-12 11:0681 °F
Water temperature2026-09-12 11:1281 °F
Water temperature2026-09-12 11:1881 °F
Water temperature2026-09-12 11:2481 °F
Water temperature2026-09-12 11:3081 °F
Water temperature2026-09-12 11:3681 °F
Water temperature2026-09-12 11:4281 °F
Water temperature2026-09-12 11:4881 °F
Water temperature2026-09-12 11:5481 °F
Water temperature2026-09-12 12:0081 °F
Water temperature2026-09-12 12:0681 °F
Water temperature2026-09-12 12:1281 °F
Water temperature2026-09-12 12:1881 °F
Water temperature2026-09-12 12:2481 °F
Water temperature2026-09-12 12:3081 °F
Water temperature2026-09-12 12:3681 °F
Water temperature2026-09-12 12:4281 °F
Water temperature2026-09-12 12:4881 °F
Water temperature2026-09-12 12:5481 °F
Water temperature2026-09-12 13:0081 °F
Water temperature2026-09-12 13:0681 °F
Water temperature2026-09-12 13:1281 °F
Water temperature2026-09-12 13:1881 °F
Water temperature2026-09-12 13:2481 °F
Water temperature2026-09-12 13:3081 °F
Water temperature2026-09-12 13:3681 °F
Water temperature2026-09-12 13:4281 °F
Water temperature2026-09-12 13:4881 °F
Water temperature2026-09-12 13:5481 °F
Water temperature2026-09-12 14:0081 °F
Water temperature2026-09-12 14:0681 °F
Water temperature2026-09-12 14:1281 °F
Water temperature2026-09-12 14:1881 °F
Water temperature2026-09-12 14:2481 °F
Water temperature2026-09-12 14:3081 °F
Water temperature2026-09-12 14:3681 °F
Water temperature2026-09-12 14:4281 °F
Water temperature2026-09-12 14:4881 °F
Water temperature2026-09-12 14:5481 °F
Water temperature2026-09-12 15:0081 °F
Water temperature2026-09-12 15:0681 °F
Water temperature2026-09-12 15:1281 °F
Water temperature2026-09-12 15:1881 °F
Water temperature2026-09-12 15:2481 °F
Water temperature2026-09-12 15:3081 °F
Water temperature2026-09-12 15:3681 °F
Water temperature2026-09-12 15:4281 °F
Water temperature2026-09-12 15:4881 °F
Water temperature2026-09-12 15:5481.1 °F
Water temperature2026-09-12 16:0081.1 °F
Water temperature2026-09-12 16:0681.1 °F
Water temperature2026-09-12 16:1281.1 °F
Water temperature2026-09-12 16:1881.1 °F
Water temperature2026-09-12 16:2481.1 °F
Water temperature2026-09-12 16:3081.1 °F
Water temperature2026-09-12 16:3681.1 °F
Water temperature2026-09-12 16:4281.1 °F
Water temperature2026-09-12 16:4881.1 °F
Water temperature2026-09-12 16:5481.1 °F
Water temperature2026-09-12 17:0081.1 °F
Water temperature2026-09-12 17:0681.3 °F
Water temperature2026-09-12 17:1281.3 °F
Water temperature2026-09-12 17:1881.3 °F
Water temperature2026-09-12 17:2481.3 °F
Water temperature2026-09-12 17:3081.3 °F
Water temperature2026-09-12 17:3681.3 °F
Water temperature2026-09-12 17:4281.3 °F
Water temperature2026-09-12 17:4881.3 °F
Water temperature2026-09-12 17:5481.3 °F
Water temperature2026-09-12 18:0081.3 °F
Water temperature2026-09-12 18:0681.3 °F
Water temperature2026-09-12 18:1281.3 °F
Water temperature2026-09-12 18:1881.3 °F
Water temperature2026-09-12 18:2481.3 °F
Water temperature2026-09-12 18:3081.3 °F
Water temperature2026-09-12 18:3681.3 °F
Water temperature2026-09-12 18:4281.3 °F
Water temperature2026-09-12 18:4881.3 °F
Water temperature2026-09-12 18:5481.3 °F
Water temperature2026-09-12 19:0081.3 °F
Water temperature2026-09-12 19:0681.3 °F
Water temperature2026-09-12 19:1281.3 °F
Water temperature2026-09-12 19:1881.3 °F
Water temperature2026-09-12 19:2481.3 °F
Water temperature2026-09-12 19:3081.3 °F
Water temperature2026-09-12 19:3681.3 °F
Water temperature2026-09-12 19:4281.3 °F
Water temperature2026-09-12 19:4881.3 °F
Water temperature2026-09-12 19:5481.3 °F
Water temperature2026-09-12 20:0081.3 °F
Water temperature2026-09-12 20:0681.3 °F
Water temperature2026-09-12 20:1281.3 °F
Water temperature2026-09-12 20:1881.3 °F
Water temperature2026-09-12 20:2481.3 °F
Water temperature2026-09-12 20:3081.3 °F
Water temperature2026-09-12 20:3681.3 °F
Water temperature2026-09-12 20:4281.3 °F
Water temperature2026-09-12 20:4881.3 °F
Water temperature2026-09-12 20:5481.3 °F
Water temperature2026-09-12 21:0081.3 °F
Water temperature2026-09-12 21:0681.3 °F
Water temperature2026-09-12 21:1281.3 °F
Water temperature2026-09-12 21:1881.3 °F
Water temperature2026-09-12 21:2481.3 °F
Water temperature2026-09-12 21:3081.3 °F
Water temperature2026-09-12 21:3681.3 °F
Water temperature2026-09-12 21:4281.3 °F
Water temperature2026-09-12 21:4881.1 °F
Water temperature2026-09-12 21:5481.1 °F
Water temperature2026-09-12 22:0081.1 °F
Water temperature2026-09-12 22:0681.1 °F
Water temperature2026-09-12 22:1281.1 °F
Water temperature2026-09-12 22:1881.1 °F
Water temperature2026-09-12 22:2481.1 °F
Water temperature2026-09-12 22:3081.1 °F
Water temperature2026-09-12 22:3681.1 °F
Water temperature2026-09-12 22:4281.1 °F
Water temperature2026-09-12 22:4881.1 °F
Water temperature2026-09-12 22:5481.1 °F
Water temperature2026-09-12 23:0081.1 °F
Water temperature2026-09-12 23:0681.1 °F
Water temperature2026-09-12 23:1281 °F
Water temperature2026-09-12 23:1881 °F
Water temperature2026-09-12 23:2481 °F
Water temperature2026-09-12 23:3081 °F
Water temperature2026-09-12 23:3681 °F
Water temperature2026-09-12 23:4281 °F
Water temperature2026-09-12 23:4881 °F
Water temperature2026-09-12 23:5481 °F
River level2026-09-12 00:005.039 ft MLLW
River level2026-09-12 00:065.187 ft MLLW
River level2026-09-12 00:125.335 ft MLLW
River level2026-09-12 00:185.479 ft MLLW
River level2026-09-12 00:245.62 ft MLLW
River level2026-09-12 00:305.758 ft MLLW
River level2026-09-12 00:365.883 ft MLLW
River level2026-09-12 00:426.014 ft MLLW
River level2026-09-12 00:486.135 ft MLLW
River level2026-09-12 00:546.253 ft MLLW
River level2026-09-12 01:006.362 ft MLLW
River level2026-09-12 01:066.453 ft MLLW
River level2026-09-12 01:126.549 ft MLLW
River level2026-09-12 01:186.637 ft MLLW
River level2026-09-12 01:246.719 ft MLLW
River level2026-09-12 01:306.808 ft MLLW
River level2026-09-12 01:366.896 ft MLLW
River level2026-09-12 01:426.978 ft MLLW
River level2026-09-12 01:487.064 ft MLLW
River level2026-09-12 01:547.152 ft MLLW
River level2026-09-12 02:007.247 ft MLLW
River level2026-09-12 02:067.343 ft MLLW
River level2026-09-12 02:127.421 ft MLLW
River level2026-09-12 02:187.49 ft MLLW
River level2026-09-12 02:247.543 ft MLLW
River level2026-09-12 02:307.589 ft MLLW
River level2026-09-12 02:367.618 ft MLLW
River level2026-09-12 02:427.641 ft MLLW
River level2026-09-12 02:487.651 ft MLLW
River level2026-09-12 02:547.648 ft MLLW
River level2026-09-12 03:007.638 ft MLLW
River level2026-09-12 03:067.605 ft MLLW
River level2026-09-12 03:127.562 ft MLLW
River level2026-09-12 03:187.507 ft MLLW
River level2026-09-12 03:247.448 ft MLLW
River level2026-09-12 03:307.379 ft MLLW
River level2026-09-12 03:367.306 ft MLLW
River level2026-09-12 03:427.218 ft MLLW
River level2026-09-12 03:487.106 ft MLLW
River level2026-09-12 03:546.982 ft MLLW
River level2026-09-12 04:006.87 ft MLLW
River level2026-09-12 04:066.752 ft MLLW
River level2026-09-12 04:126.637 ft MLLW
River level2026-09-12 04:186.526 ft MLLW
River level2026-09-12 04:246.375 ft MLLW
River level2026-09-12 04:306.247 ft MLLW
River level2026-09-12 04:366.125 ft MLLW
River level2026-09-12 04:425.994 ft MLLW
River level2026-09-12 04:485.873 ft MLLW
River level2026-09-12 04:545.738 ft MLLW
River level2026-09-12 05:005.61 ft MLLW
River level2026-09-12 05:065.482 ft MLLW
River level2026-09-12 05:125.364 ft MLLW
River level2026-09-12 05:185.24 ft MLLW
River level2026-09-12 05:245.112 ft MLLW
River level2026-09-12 05:304.993 ft MLLW
River level2026-09-12 05:364.875 ft MLLW
River level2026-09-12 05:424.76 ft MLLW
River level2026-09-12 05:484.646 ft MLLW
River level2026-09-12 05:544.534 ft MLLW
River level2026-09-12 06:004.419 ft MLLW
River level2026-09-12 06:064.311 ft MLLW
River level2026-09-12 06:124.193 ft MLLW
River level2026-09-12 06:184.088 ft MLLW
River level2026-09-12 06:243.983 ft MLLW
River level2026-09-12 06:303.875 ft MLLW
River level2026-09-12 06:363.766 ft MLLW
River level2026-09-12 06:423.648 ft MLLW
River level2026-09-12 06:483.54 ft MLLW
River level2026-09-12 06:543.425 ft MLLW
River level2026-09-12 07:003.31 ft MLLW
River level2026-09-12 07:063.192 ft MLLW
River level2026-09-12 07:123.077 ft MLLW
River level2026-09-12 07:182.969 ft MLLW
River level2026-09-12 07:242.854 ft MLLW
River level2026-09-12 07:302.733 ft MLLW
River level2026-09-12 07:362.628 ft MLLW
River level2026-09-12 07:422.523 ft MLLW
River level2026-09-12 07:482.411 ft MLLW
River level2026-09-12 07:542.297 ft MLLW
River level2026-09-12 08:002.192 ft MLLW
River level2026-09-12 08:062.08 ft MLLW
River level2026-09-12 08:121.985 ft MLLW
River level2026-09-12 08:181.883 ft MLLW
River level2026-09-12 08:241.778 ft MLLW
River level2026-09-12 08:301.676 ft MLLW
River level2026-09-12 08:361.575 ft MLLW
River level2026-09-12 08:421.473 ft MLLW
River level2026-09-12 08:481.381 ft MLLW
River level2026-09-12 08:541.293 ft MLLW
River level2026-09-12 09:001.207 ft MLLW
River level2026-09-12 09:061.112 ft MLLW
River level2026-09-12 09:121.027 ft MLLW
River level2026-09-12 09:180.945 ft MLLW
River level2026-09-12 09:240.869 ft MLLW
River level2026-09-12 09:300.794 ft MLLW
River level2026-09-12 09:360.718 ft MLLW
River level2026-09-12 09:420.65 ft MLLW
River level2026-09-12 09:480.594 ft MLLW
River level2026-09-12 09:540.551 ft MLLW
River level2026-09-12 10:000.538 ft MLLW
River level2026-09-12 10:060.561 ft MLLW
River level2026-09-12 10:120.64 ft MLLW
River level2026-09-12 10:180.778 ft MLLW
River level2026-09-12 10:240.997 ft MLLW
River level2026-09-12 10:301.263 ft MLLW
River level2026-09-12 10:361.545 ft MLLW
River level2026-09-12 10:421.821 ft MLLW
River level2026-09-12 10:482.064 ft MLLW
River level2026-09-12 10:542.303 ft MLLW
River level2026-09-12 11:002.533 ft MLLW
River level2026-09-12 11:062.756 ft MLLW
River level2026-09-12 11:122.986 ft MLLW
River level2026-09-12 11:183.189 ft MLLW
River level2026-09-12 11:243.386 ft MLLW
River level2026-09-12 11:303.586 ft MLLW
River level2026-09-12 11:363.773 ft MLLW
River level2026-09-12 11:423.957 ft MLLW
River level2026-09-12 11:484.124 ft MLLW
River level2026-09-12 11:544.278 ft MLLW
River level2026-09-12 12:004.429 ft MLLW
River level2026-09-12 12:064.587 ft MLLW
River level2026-09-12 12:124.751 ft MLLW
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Source provenance and cached requests
Horizon distance · 84 in camera height
Geometric horizon3.24 mi
With standard refraction3.50 mi
Adjust height

Lens height above water. Assumed refraction: k=0 and 1/7—not measured.

Blank uses recorded height. Changes are not saved.

Refraction needed to match this observation

Recorded lens height: 7 ft above water.

Required coefficientk ≈ -0.166
Upward bending needed1.2× standard refraction

This convex-Earth model requires light to bend upward 1.2 times as strongly as standard refraction. This is a calculated model requirement, not a measurement of the atmosphere.

Observation & model assumptions

Apparent horizon approximately 3 miles away · obvious inferior mirage reported.

This fits the reported approximate horizon distance, not the mirage image. An inferior mirage supports upward bending locally; a single-curvature horizon fit cannot reconstruct layered mirage paths, even when its fitted bending is downward.

The effective-sphere horizon arc is inverted numerically using radius R/(1−k), exactly matching the horizon comparison above. The approximate reported distance makes this an approximate requirement.

One uniform-curvature convex-Earth model; positive k means downward bending. Standard k = +1/7 ≈ +0.143; Earth radius 3,958.76 miles. Water/bow fits use the small-angle parabolic approximation and assume the shoreline water is behind the bow on the same sightline. Lens height is above local water. Observer-provided distances, heights and classifications are not calibrated atmospheric measurements. No detectable mirage does not mean no refraction; this fit does not exclude layered explanations.

Photos

14 high-quality images ordered by capture date

Videos

2 video clips; poster frames shown where available