You are viewing a single comment's thread from:

RE: Kill Time At Work With Recreational Math: Calculate Sunset and Sunrise Times

in #steemstem • 7 years ago (edited)

That's interesting that you had to adjust your JD by 0.5 day. That means your M could be off as well, but the error of 0.5 of a day in that calculation would only amount to about 2 minutes difference in sunset and sunrise.

7 years ago in #steemstem by
$0.07
  • Past Payouts $0.07
  • - Author $0.06
  • - Curators $0.02
1 vote
Reply 1
Sort:  
  • Trending
    • [-]
     7 years ago (edited)

    Thanks. I found the problem: I had originally set the Western calendar date in cell C9 to start at 12 noon in order to emulate the Julian calendar pattern of starting the day at noon. I should not have done that.

    The equation in cell C21 for J_transit also does this. I guess the person developing the system of equations was already compensating for this.

    So there was a double compensation for the Julian calendar quirkiness of starting the day at noon which gave me the error of being off by 12 hours.

    I have now adjusted cell C9 to start at midnight (12:00:01 am) and set cell C21 back to the form of the equation in Wikipedia and everything works.

    $0.00
      Reply