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Thread ID: 118988	2011-06-30 00:20:00	Amizuth?	Nomad (952)	PC World Chat

Post ID	Timestamp	Content	User
1213442	2011-06-30 05:12:00	You seem to be arse about face........ If I read your first post correctly, the software will give the sun's azimuth angle for the date and time of day at your lattitude and longitude, presumably you need this if it is heavily overcast. Use your compass to determine true north. It is around 20 degrees to the west of magnetic north. The azimuth angle from the software program will be "x" degrees either to the east or west of true north depending upon the time of day. Use the compass to mark off those degrees in the right direction, it is easier if you have a "Silva" compass which has a rotating bezel and a direction of travel line and arrow. By the time you have done all this the sun will have moved in the sky, so you will have to start all over again..........:D	Terry Porritt (14)
1213443	2011-06-30 05:17:00	Thanks for that. My GPS has true north :thumbs: What I think I will do .... go out and get the GPS coordinates from where my camera is. Then use the GPS compass and note the range where I want the sun to be. Go on the software and mark my GPS position on the map, that will tell me the sun's azimuth, like 66.1 - 55.0 degrees at sunrise to an hour later. Hopefully my range will fall in that area. I can also play with diff months of the year to better fit .... Sunset is about 301 degrees. Is the 66 degrees and the 301 degrees just what's on my GPS compass? Is 66 just NE and 300 is NW :confused:	Nomad (952)
1213444	2011-06-30 05:29:00	Yes a friend of mine got some Samsung phone with a GPS in it and google earth you just switch it into astronomy mode and hold it up facing the sky and move it around and it shows you where the stars and planets are at that present point of time in the sky. :)	Trev (427)
1213445	2011-06-30 05:31:00	Thanks for that . My GPS has true north :thumbs: What I think I will do . . . . go out and get the GPS coordinates from where my camera is . Then use the GPS compass and note the range where I want the sun to be . Go on the software and mark my GPS position on the map, that will tell me the sun's azimuth, like 66 . 1 - 55 . 0 degrees at sunrise to an hour later . Hopefully my range will fall in that area . I can also play with diff months of the year to better fit . . . . Sunset is about 301 degrees . Is the 66 degrees and the 301 degrees just what's on my GPS compass? Is 66 just NE and 300 is NW :confused: 360 is north, 090 is east, 180 is south and 270 is west . :)	Trev (427)
1213446	2011-06-30 05:33:00	"...Is the 66 degrees and the 301 degrees just what's on my GPS compass? Is 66 just NE and 300 is NW ....." More or less. True North is 0 degrees, East 90 degrees, South 180 degrees, West 270 degrees. So NW would be 315 degrees and NE is 45 degrees.	Terry Porritt (14)
1213447	2011-06-30 05:42:00	Thanks everyone. I may look into a Android in due time :p That software on my PC works on iPhones and Androids. My GPS has magnetic bearings, it says it's 22 degrees off. Now that wasn't too hard :D	Nomad (952)
1213448	2011-06-30 09:01:00	Just a follow up question . I have used a no . of weather sites, they don't advise first light and last light of the day? Does one calculate this from data from various websites who publishes: Civil twilght 6 . 59am - 5 . 56pm Astronomical twilight 5 . 54am - 7 . 01pm Nautical twilight 6 . 26am - 6 . 29pm Obviously it's not twilight from morning to evening . That may just be the position when the sun is a certain degrees below the horizon right . Secondly, before twilight, so before 6am or 5am is the sky just black than a dark blue?	Nomad (952)
1213449	2011-06-30 09:09:00	Do you mean sunrise and sunset ? You can get these from astronomical tables, or your local paper will have them for that day too. www.rasnz.org.nz	Terry Porritt (14)
1213450	2011-06-30 10:18:00	I mean light. Ie., winter, the sun rises when there is already white light. I am wanting how one gets the time when there will be light and when after sunset you will get darkness as in a black sky? The same with twilight. When would the sky turn dark blue, is this the time provided in the twilight data I gave and does it conclude at the above times I gave like 7pm?	Nomad (952)
1213451	2011-06-30 10:40:00	That would be very subjective and dependent on weather conditions. Why not use the legal lighting up times: half an hour before sunrise and half an hour after sunset. www.nzta.govt.nz	Terry Porritt (14)
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