01-13-2017, 08:06 PM
(01-13-2017, 02:32 PM)c_davidson Wrote: Carlos,
For yesterday, January 12, 2017 the EoT for 12h was 08:24.
Is this method correct? If it was GMT 16:00 then the approximate Sun GHA would be-
16-12= 4 hours
4 x 15°= 60°
EoT converted to angle;
8 minutes 24 seconds converted to angle= 2° 06'
60° - 2° 06'= 57° 54' (GHA of the Sun on January 12, 2017 at GMT 16:00)
The correct GHA is 57° 53.1' as listed in The Nautical Almanac.
How does that sound to you?
Clen
That's pretty convenient. The USNO Astronomical Phenomena for the year 2017 page- 18 has a list of the Equation of Time for 00 h GMT for each day of the year. But, it's only for GMT 00 h. Confound it!
It also includes declination of the Sun.
Find it here- Equation of Time & declination
Craig