03-03-2018, 10:02 PM
(This post was last modified: 03-03-2018, 10:02 PM by c_davidson.)
Most instructive, Wannathermal.
I had been confused as to whether this discussion was about DR or Ap or plotting an LOP. Now I understand that when determining the Ap longitude for plotting in the Eastern hemisphere that we must do the following, and please tell me if I'm wrong;
In Eastern longitudes LOP Ap longitude is determined as follows;
- To get Ap longitude take your DR longitude add (0°60' minus minutes of GHA)
So in your real example above the formula would look like this;
18° + (0°60' - 0°54') = 18° 06' (which will be the Ap longitude)
Please, would you tell us if there are exceptions to this rule, such as if GHA minutes were less than 30?
Nice work!
Clen
I had been confused as to whether this discussion was about DR or Ap or plotting an LOP. Now I understand that when determining the Ap longitude for plotting in the Eastern hemisphere that we must do the following, and please tell me if I'm wrong;
In Eastern longitudes LOP Ap longitude is determined as follows;
- To get Ap longitude take your DR longitude add (0°60' minus minutes of GHA)
So in your real example above the formula would look like this;
18° + (0°60' - 0°54') = 18° 06' (which will be the Ap longitude)
Please, would you tell us if there are exceptions to this rule, such as if GHA minutes were less than 30?
Nice work!
Clen