Sunset shade- what compass azmuth?

john408 · Post by **john408** » Sat Jul 12, 2008 5:29 pm

Ok, so this may seem a bit anal, but anyone who accidentally or on purpose positioned their camp front porch to catch the full shadow from their tent or RV in the afternoon, got a a nice gift. So let me ask the questions and hopefully someone knows this for BM08:
1. If you follow the 6:00 street what compass heading is it...pls specify from true north or magnetic north?
2. Again from (specify) true or magnetic north
a. Compass azimuth of the setting sun
b. Compass azimuth of the rising sun
c. Compass azimuth of the most prevalent wind (blowing from)

Thanks...Lovetoy, Silicon Village

Bob · Post by **Bob** » Sat Jul 12, 2008 5:34 pm

6:00 orients southwest-northeast true north within a degree or two.

Afternoon wind is SW, reverses to NE early morning.

phil · Post by **phil** » Sat Jul 12, 2008 6:22 pm

The sun sets at about 290 degrees, according to my compass. See this photo for a map of BRC that shows north:

Bob · Post by **Bob** » Sat Jul 12, 2008 6:46 pm

http://aa.usno.navy.mil/data/

Oldguy · Post by **Oldguy** » Sat Jul 12, 2008 8:40 pm

Monday
25 August 2008 Pacific Daylight Time

SUN
Begin civil twilight 5:54 a.m.
Sunrise 6:22 a.m.
Sun transit 1:01 p.m.
Sunset 7:40 p.m.
End civil twilight 8:08 p.m.

MOON
Moonset 3:15 p.m. on preceding day
Moonrise 12:17 a.m.
Moon transit 8:18 a.m.
Moonset 4:19 p.m.
Moonrise 1:22 a.m. on following day

Oldguy · Post by **Oldguy** » Sat Jul 12, 2008 8:56 pm

This years map shows North to align between 4 o'clock and 4:30 o'clock radials. If you arrive before 7am, you can still see Polaris and line up your front door to North.

http://burningman.com/media/doc/prepara ... 08_map.pdf

Digital-Dragonfly · Post by **Digital-Dragonfly** » Sat Jul 12, 2008 9:16 pm

those numbers mean something.... to some of us.

golgotha-a-go-go · Post by **golgotha-a-go-go** » Sat Jul 12, 2008 9:32 pm

Have fun with this....just what you need.

http://squ1.com/archive/index.php?solar ... ition.html

john408 · Post by **john408** » Sun Jul 13, 2008 10:41 am

This is what I thing from your replies ...thanks...please correct if I am wrong, fill in where you can.

1. If you follow the 6:00 street what compass heading is it...pls specify from true north or magnetic north? Ans: 6:00 faces compass 45 degrees from true magnetic North
2. Again from (specify) true or magnetic north
a. Compass azimuth of the setting sun Ans: 290 degrees from true north
b. Compass azimuth of the rising sun Ans: not sure about this??
c. Compass azimuth of the most prevalent wind (blowing from) Ans: Not sure about this

Lovetoy

Bob · Post by **Bob** » Sun Jul 13, 2008 11:07 am

Crikey.

phil · Post by **phil** » Sun Jul 13, 2008 12:02 pm

> 45 degrees from true magnetic North

John408, there's some confusion here. I think that "True North" is not "Magnetic North." True North and Magnetic North generally are not the same (there may be occasional exceptions where they align).

> Compass azimuth of the setting sun Ans: 290 degrees from true north

I think that compasses show Magnetic North, not True North.

God is not love. There is no god. There is, however, love. I hope I've made some small contribution to clearing up your confusion.

Bob · Post by **Bob** » Sun Jul 13, 2008 12:23 pm

Compasses show true north if you compensate for the local magnetic declination, which changes from year to year and can be estimated here --
http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp
-- should be about 15 degrees E.

However, maps & site surveys are made by humans, not nature, so Burning Man's site plans, north arrows, and the as-built layout of BRC may not exactly resemble what you think you're seeing. So, bring a $20 compass and you can orient your camp as you see fit.

chiefdanfox · Post by **chiefdanfox** » Sun Jul 13, 2008 4:30 pm

As close to BRC as I could get 119 14 28 W, 40 44 15 N
8/25/08
Sunrise AZ = +75 54' One fist width from due east towards the north
Sunset AZ =+ 279 30' One fist width from due west towards the south
True bearings so, Cub scouts set your declination correctly! 14 25' E (substract this from AZ calculation)
More of Satan's work!
|
V

john408 · Post by **john408** » Mon Jul 14, 2008 6:24 pm

Thanks especially Chiefdanfox and Phil....don't know what I was thinking confusing true and magnetic
so to be boring...this is my summary

This is what I think from your replies ...thanks...please correct if I am wrong (again), fill in where you can.

1. If you follow the 6:00 street what compass heading is it...pls specify from true north or magnetic north? Ans: 6:00 street faces compass 45 degrees from magnetic North
2. Again from (specify) true or magnetic north
a. Compass azimuth of the setting sun Ans: 265 or 290 ??degrees from magnetic north- which?
b. Compass azimuth of the rising sun Ans: 61+ degrees from magnetic north
STILL WOULD LIKE BEST INPUT ON THIS:
c. Compass azimuth of the most prevalent wind (blowing from) Ans: ???

Thanks. Lovetoy

Bob · Post by **Bob** » Mon Jul 14, 2008 10:01 pm

AGAIN, the arrow shown on the BRC map, as with all maps, is appx true north. 6:00 orients SW-NE, and the prevailing wind is appx SW.

Learn how to use a map & compass & the websites provided, please.

Token · Post by **Token** » Tue Jul 15, 2008 7:03 am

True North or magnetic North makes no difference since you do not know which will be used by the guy/gal running the survey team and implementing the city layout. So all this stuff here is us having a jolly time trying to make you actually think and figure this out on your own but you refuse to do so despite the valiant effort of many here.

So, to put it mildly, we have brought you to the water but it is up to you to drink, so to speak.

You also should know that we could be telling you all the wrong data, just to have even more fun. This is a cacophony event after all.

Just Sayin.

1. If you follow the 6:00 street what compass heading is it...pls specify from true north or magnetic north?

Ans: 6:00 street faces compass 0.785 Radians from North

2. Again from (specify) true or magnetic north
a. Compass azimuth of the setting sun

Ans: 4.974 Radians from North

b. Compass azimuth of the rising sun

Ans: 1.309 Radians from North

STILL WOULD LIKE BEST INPUT ON THIS:
c. Compass azimuth of the most prevalent wind (blowing from)

Ans: 3.142 to 3.927 Radians from North

EvilDustBooger · Post by **EvilDustBooger** » Tue Jul 15, 2008 7:24 am

And please be advised:
"That because of the increasing numbers of people
that have been sneaking into the event through the voids in the trash fence that lie between true north, grid north & magnetic north, it is now required for all attendees to be in possesion of a ticket in order to leave the event."

Bob · Post by **Bob** » Tue Jul 15, 2008 8:23 am

Ugly Dougly · Post by **Ugly Dougly** » Tue Jul 15, 2008 10:20 am

Keep in mind the effect of large metallic art projects.

Sunset shade- what compass azmuth?

Sunset shade- what compass azmuth?

Daylight hours Monday 08/25/08

Thank you...

Solar position

Here is a summary about azmuth and sunset so far....