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Great Circle Formula  
User currently offlineSSTjumbo From , joined Dec 1969, posts, RR:
Posted (12 years 11 months 2 weeks 5 days 11 hours ago) and read 2599 times:

Could anyone give me an accurate version of the Great Circle Formula and present it so it makes sense? Every site I go to seems to not know about the algebraic rule (grouping symbols, exponents, etc.) and presents it with different notations. I figure I would ask people in this forum because pilots need to figure out distances. Thanx!!!

2 replies: All unread, jump to last
 
User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 1, posted (12 years 11 months 2 weeks 5 days 1 hour ago) and read 2580 times:

http://www.best.com/~williams/avform.html

You'll find lots of discussion by trying "Search" and entering "Great Circle".

Have fun with the numbers!

Buff


User currently offlineTimz From United States of America, joined Sep 1999, 6772 posts, RR: 7
Reply 2, posted (12 years 11 months 2 weeks 3 days 16 hours ago) and read 2553 times:

Yup, Ed Williams site is helpful for that and other things too. Notice that you'll need to decide whether you want to assume the Earth is a sphere or a spheroid (the slightly-squashed sphere that gives more accurate results). The formulas for the spheroid are far more complicated, but Williams' site takes care of that too. If you have accurate WGS84 lat-lons for the airports you're interested in you can use his calculator to get distances accurate to-- well, to whatever the lat-lons are accurate to.

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