Latitude coordinate for 2018?

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thnkfl
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Latitude coordinate for 2018?

Post by thnkfl » Thu Jun 14, 2018 3:07 pm

Am making a sundial for the burn. Does anyone know the exact latitude of the man this year?
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Token
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Re: Latitude coordinate for 2018?

Post by Token » Thu Jun 14, 2018 3:50 pm

That datum will not be posted until the golden spike gets placed in early August.

You can get approximate data from last years Google Earth and whatnot.

You can get some historical data from William Keller’s site and the work he did on GPS maps :

https://www.wkeller.net/BRC-GPS/

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XPTom
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Re: Latitude coordinate for 2018?

Post by XPTom » Thu Jun 14, 2018 7:47 pm

http://www.mytopo.com/maps/?lat=40.7864 ... .2066&z=15

use the link to my topo(then select satellite view) and put your mouse over the spot you expect to be in...... you will get a latitude similar to what is in the link...
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Canoe
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Re: Latitude coordinate for 2018?

Post by Canoe » Thu Jun 14, 2018 8:21 pm

Best I could come up with for my BRC Sun- Rise/Hourly/Set Heading & Elevation map was:
  • 2015: 40.8060136, -119.1542816
    2016: 40.7842516, -119.2007847
    2017: 40.7854981, -119.2064667
    2018: 40.7839267, -119.2096253 - UNCONFIRMED (and, I didn't note the source... :oops: )
Due to the delta in elevation and azimuth through the week, I used Aug 30 in 2015, Aug 28 in 2016 and Aug 28 in 2017. Sunrise, sunset, 1 pm azimuth & elevation:
  • 2015: 6:21:25 am, 7:32:22 pm, 181.28 & 58.08
    2016: 6:20:25 am, 7:34:30 pm, 181.03 & 58.54
    2017: 6:20:12 am, 7:34:55 pm, 180.99 & 58.63
(of course I only noted solar noon for 2016, and as 12:57; 1 pm for all was slightly past South)

How accurate are you expecting.
I found an observable change between the location of 2015 vs 2016/2017, but between 2016 and 2017 the azimuth difference was less than the width of the line.
Is there much variance in a sundial based on the values for 2016 vs. 2017?
Their difference vs. the difference through the week?

If you get a confirmed lat & long for 2018, please publish here.
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thnkfl
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Re: Latitude coordinate for 2018?

Post by thnkfl » Fri Jun 15, 2018 5:10 pm

Thanks for all the input. According to Mr. Google, a degree of latitude (at 38 deg.) is equal to 364,000 feet. Using Canoe's coordinates, the difference in latitude between 2016 and 2017 amounts to about 450 feet -- close enough to not significantly be a problem, given the size of the gnomon. I will still look forward to an actual number so I may have it correct when printed (it is a small, business card size sundial.)

If Token, XPTom, or Canoe would like one in advance, PM me with a mailing address.

Thanks again.
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Re: Latitude coordinate for 2018?

Post by retropsycho » Tue Jul 17, 2018 12:51 pm

The Man: 40.7864, -119.2065
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