01-13-2017, 02:10 PM
(This post was last modified: 01-13-2017, 02:12 PM by CarlosPindle.)
You can determine GHA, closely, of an integral hour by taking the EoT (Equation of Time) and converting it to an angle and then subtracting or adding it to the GMT integral hour (converted to an angle). Whether you add or subtract the EoT is determined by the time of Mer. Pass listed next to the EoT on each of Sun & Moon pages of The Nautical Almanac.
The bottom of The Nautical Almanac Sun and Moon page has the Equation of Time for each day on the bottom right hand side of said pages. To get a more accurate figure use an EoT that is closest to the present hour of GMT.
At most you'll be off by around 2 minutes of arc. Not bad if you're 1,000 nm from land.
Do you have any other ideas about this?
Carlos
The bottom of The Nautical Almanac Sun and Moon page has the Equation of Time for each day on the bottom right hand side of said pages. To get a more accurate figure use an EoT that is closest to the present hour of GMT.
At most you'll be off by around 2 minutes of arc. Not bad if you're 1,000 nm from land.
Do you have any other ideas about this?
Carlos