USNO Data for 2017 Solar Eclipse for
USNO Clear Sky Chart


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from: http://aa.usno.navy.mil/data/docs/Eclipse2017.php

Solar Eclipse Computer

U.S. Naval Observatory
Astronomical Applications Department

Solar Eclipse of 2017 Aug. 21

Sun in Partial Eclipse at this Location

USNO

August 21, 2017   Universal Time(UT)Delta T: 69.4s
PhenomenonDayTime(UT)AltitudeAzimuthPosition AngleVertex Angle
Eclipse Begins2117:17:47.062.9183.5284.1281.5
Maximum Eclipse2118:42:42.056.2223.1
Eclipse Ends2120:01:32.443.6246.1123.677.1


Duration2h 43m 45.4s
Magnitude0.845
Obscuration81.1%
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These times are in Universal Time or GMT. Subtract 4 hours to get local time (Accurate only if the timezone for the USNO clear sky chart is really GMT-4.) GMT times are accurate only if the latitude/longitude of the chart for USNO is accurate. Check the road map.


Forecast History for the USNO clear sky chart for late August

Extracted from the USNO clear sky chart climate/history page.
With the help of sponsors.

Cloud Cover

Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
AugustOccurrence of each Forecastdata points
16th to endDay
11%415%5%46%5%7%8%39%
2100

Transparency

Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
AugustOccurrence of each Forecastdata points
16th to endDay
39%7%11%22%16%2
2100

DISCLAIMER: This weather data is based from past forecast records, not from sky observations. So it's possible that it is not an accurate indication of weather for the eclipse. If you miss seeing the eclipse because you took a climate/history page for a clear sky chart, or the weather data on this page, too literally, your only recourse is to complain to me in email. Reminder: by using this website you agree to not sue me for any reason.


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