A Source of Confusion in Selecting an Assumed Position

[CarlosPindle]

Hi All,

I'm confused by the result I got using Astron here- https://friendsofthevigilance.org.uk/Astron/Astron.html
Note- Astron DOES NOT use DR Latitude or DR Longitude. It was Assumed Latitude and Assumed Longitude.

I used the following figures;

Date- March 29, 2023
UTC- 1300
Ap Latitude- N 40°
Ap Longitude- E 060° 30'

Body- Sun UL

Hs- 15° 00.0
He- 3 meters
Ho- 14° 37.5'

Hc- 14° 11.3'

GHA- 13° 47.7' (that's fine)
LHA- 74° 17.7' (if I were using paper it would be 74°)



Now, the problem is when you click the button at the bottom of Astron "Add sight" and then "Log/Plotter" the "Ass Long" reads
E 060° 30'

Isn't it the Ap Longitude supposed to be 60° 12.3' ????

I have no idea why Astron uses a "decide for yourself" Ap longitude instead of using a DR longitude whole degree figure.

Can anyone explain why there's a difference between Astron an the way Peter describes it above?

Infinite thanks,

Carlos