Measuring Earth's Tilt

Part 1 introduces history of measuring Earth's tilt and shows 3 ways it can be measured using one stick. Part 2 shows how the tilt formulas are obtained.
0:00 Introduction
0:24 Historical background
1:00 Zones, solstices, equinoxes
1:45 Measuring angles, 3 methods
3:28 Method 1
7:13 Method 2
8:58 Method 3
10:25 Summary of results
11:15 Latitude
11:48 Theory for Method 1
15:06 Theory for Method 2
16:38 Theory for Method 3

[@asaitoru8245]

Bravo , What an effective and genius measure methods , love it so much

[@peterbloch5590]

Glad you like it!

[@vimalramachandran]

Brilliant! If you are measuring from the South Pole on the December solstice, what formula should be used?

[@peterbloch5590]

Good question since I did not deal with the southern hemisphere.
Finding tilt at your winter solstice (June) is T = L - Iws where your latitude L is a positive number.
Finding tilt at your summer solstice (December) is T = L - Iss
Finding tilt at your autumn equinox is T = L - Iws; or if you measure your latitude, Iae, then
T = Iae - Iws.
If you use the summer and winter solstices, then T = (Iss - Iws)/2 . The angle of incidence is greater at your summer solstice than at your winter solstice.

[@santoshkumarpanthika]

Please refer which book we have read to know all this measuring formula