Astronomical Discoveries You Can Make, Too! by Robert K. Buchheim

Author:Robert K. Buchheim
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(Eq. 3.8)

in hours, whereΦ is your longitude, in degrees

D is T + Z – TJD0 in days

T is the date/time (e.g. the date/time of one of your images)

TJD0 is 2000 Jan 01 12:00:00 (UT)

Z is the time difference between your clock time and Universal Time19. For example, if your clock is set to USA Pacific Standard Time, then Z = 8 hours. If you followed my instructions and set your clock to UT, then Z = 0.

A spreadsheet will easily perform the necessary calculations, but there are a few tricks to using this equation. Your clock date/time, T, and the reference date/time, TJDO, should be written to the nearest second. The parameter “D” must be expressed in decimal days to an accuracy of 1 second (≈0.00001 day). Your longitude should be accurate to about ±0.05 degree (±3 minutes of arc) or better. Regarding the term “±Φ/15”, use “+” if your longitude is expressed as degrees East of Greenwich and use “– ” if it is expressed as degrees West of Greenwich. Finally, don’t round off the coefficients in Eq. 3.8; use all of the digits!

The value of “LSTE” that is returned by Eq. 3.8 will be a very large number, because that equation accumulates the changing LST day-by-day; it doesn’t re-set itself to LST = 0 at the start of each new (sidereal) day. You will need to reduce it to the range 0–24 hours of RA by

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.