Determining Your Location
With the Sun
Select Month
Select Day
Enter Post Height
POST SHADOW DATA ENTRY
Select Number Of Samples
Sample # UT Hr   Min   Sec
Shadow Length


Site Longitude
Site Latitude

To do an experiment to measure your approximate longitude and latitude using the sun, you will need to set up a vertical pole on a flat, horizontal surface in a sunny location, mark the position of the pole on the surface and mark the position of the pole end's shadow at various times around solar noon at your location. Solar noon is halfway between sunrise and sunset. The times for these for each day may be found often in your local newspaper or you may use a website calculators. Everytime you mark a "shadow" point, you should record the local time and, when done, convert to Universal Time. Use the following table to record you data:

Date: ________________

Site Location: __________________________

UT - LocalTime = _____h _____m _____s

Post Height = __________

Shadow Sample # Local Time
(HH:MM:SS)
Universal Time
(HH:MM:SS)
Shadow Length
1      
2      
3      
4      
5      
6      
7      
8      
9      
10      
11      

To use the calculator,

Sample data for
Date: February 16 2006
Site Location: Washington, DC
UT - LocalTime = 5h 0m 21s
Post Height = 91.7 cm
Shadow Sample # Local Time
(HH:MM:SS)
Universal Time
(HH:MM:SS)
Shadow Length
(cm)
1 11:19:40 16:20:01 122.5
2 11:32:15 16:32:36 119.4
3 11:44:32 16:44:53 117.5
4 11:53:02 16:53:23 116.5
5 12:04:45 17:05:06 115.2
6 12:12:22 17:12:43 113.9
7 12:20:56 17:21:17 114.3
8 12:28:32 17:28:53 114.2
9 12:38:44 17:39:05 114.1
10 12:56:26 17:56:47 116.8
11 13:05:45 18:06:06 118.8
12 13:14:02 18:14:23 120.7
13 13:21:14 18:21:35 122.3
14 13:33:59 18:34:20 126.2
15 13:48:19 18:48:40 132.4
16 14:08:58 19:09:19 141.5
17 14:46:59 19:47:20 166.1