Question

How do you measure the tilt of the earth?

Answer 1

At summer solstice (about June 22) noon, if your height is h, shadow length is l and your are at latitude `theta^o N`, the tilt angle is `(tan^(-1)(l/h)-theta)^o`.,

Explanation:

The angle of incidence of light rays for latitude `theta^o N` varies

periodically, over a year as period, from

'`theta`+ tilt angle', at noon on summer solstice (about June 22) to

'`theta`- tilt angle', at noon on winter solstice (about December 21),

and back to

'`theta`+ tilt angle', for the next summer solstice.

Use, tan (angle of incidence of solar rays)=(length of the

shadow)/(height), at noon.