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assumed longitude
#1
Gentlemen,

Quite recently  I've identified little (  maybe ;>) problem, I ignored for a long time. Let  me make it short and concise:

Working on LOP  for a star.  To find LHA to use in Pub.229, vol. 3  input,  I need to add GHA Aries to  SHA of the star and subtract DR longitude.  Well, as you know, to get  the whole number for LHA I need to  use the assumed longitude.  
And this is where I  found a little problem.:

Depending on the order of adding and subtracting,  the  magnitude of assumed longitude  is changing.    In minutes, of course.  But still is changing.

The example:

 GHA Aries-  212-05.7
SHA of the star 146-09.1
Dr Longitude- 41-50w.

Now,  to get LHA  I add  212--05.7 + 146-09.1= 358-14.8

LHA of the star= 358-14.8  - 41-14.8= 317.

Assumed longitude is 41-14.8.

But,  if  I do  it slightly different,

GHA Aries-  DR  Assumed longitude= 212-05.7  - 41-05.7= 171
171 + SHA of the star = 171+ 146-09.1= 317-09.1.=LHA.  I can round it to 317.

  But in this case  assumed longitude is 41-05.7.  Not 41-14.8  like in the above.

And my question is: What assumed longitude to take? Because the difference is NOT zero.

Please, enlighten me.

Thank you.
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Messages In This Thread
assumed longitude - by Rumata - 10-06-2023, 05:38 PM
RE: assumed longitude - by PeterB - 10-07-2023, 07:41 PM
RE: assumed longitude - by Rumata - 10-07-2023, 10:34 PM

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