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.
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.