07-09-2018, 10:36 AM
Joe,
"the minutes symbol would indicate the vertical numbers are minutes of declination past the hour."
The ' (minutes symbol) is only the minutes of declination for, let's say, the Sun (or any celestial object).
Here's an example;
Date- July 9, 2018
Time- 12:00:00 GMT
Body- Sun
Declination- 22° 19.4
Lets' say when doing a Sun sight reduction you find a "d" value of 22 in Pub. 249 or 229.
Using the minutes of declination 0° 19' (rounded down as the .4 isn't important) and the "d" of 22 a "d correction" figure of 7 is found.
That being said, it doesn't matter which column you use to obtain the d correction- the result is the same.
I've never been able to figure out how to mathematically get d.
Does that help?
Fred
"the minutes symbol would indicate the vertical numbers are minutes of declination past the hour."
The ' (minutes symbol) is only the minutes of declination for, let's say, the Sun (or any celestial object).
Here's an example;
Date- July 9, 2018
Time- 12:00:00 GMT
Body- Sun
Declination- 22° 19.4
Lets' say when doing a Sun sight reduction you find a "d" value of 22 in Pub. 249 or 229.
Using the minutes of declination 0° 19' (rounded down as the .4 isn't important) and the "d" of 22 a "d correction" figure of 7 is found.
That being said, it doesn't matter which column you use to obtain the d correction- the result is the same.
I've never been able to figure out how to mathematically get d.
Does that help?
Fred