DSP Robotics Support

Posted: **Mon Apr 03, 2017 11:56 am**

So I found this Sunrise - Sunset formula on-line and thought it would be interesting to put it into Ruby, so I did, and it worked (eventually) :lol:

Here it is for anyone who's interested:

Sunset Algorithm with Altitude.fsm: (2.04 KiB) Downloaded 1036 times

Posted: **Mon Apr 03, 2017 6:19 pm**

that is cool !
8-)

Posted: **Mon Apr 03, 2017 7:30 pm**

Yeah I thought so too. It seems very accurate when compared to on-line calculators. Not too sure about the altitude though . . . I added that myself after a little googling, hope I got it right :oops:

Posted: **Wed Apr 05, 2017 8:30 am**

The calculated times for sunset/sunrise are 4 hours later than they actually are. I checked the longitude/latitude coordinates for my zip code and they are correct. Any ideas?

Posted: **Wed Apr 05, 2017 9:04 am**

Hi PrDavid

I think it may be something to do with this line here:

# 10. convert UT value to local time zone of latitude/longitude

# localT = UT + localOffset + dst

localtr = utr + 0 + dst
localts = uts + 0 + dst

I may be wrong but I think the local offset is the difference between your time zone and 0 deg longitude. this would be 1 hour for every 15 deg. Mine is set to 0 because I'm in the UK. I'll dig out the original formula I found when I get home from work and post it up.

DSP Robotics Support

Sunrise - Sunset Calculator (Ruby)

Sunrise - Sunset Calculator (Ruby)

Re: Sunrise - Sunset Calculator (Ruby)

Re: Sunrise - Sunset Calculator (Ruby)

Sunrise Sunset Calculator Ruby

Re: Sunrise - Sunset Calculator (Ruby)