How to make sundial in physics
Answers
First thing in the morning, place the board on a flat surface in a spot that receives sun all day long.
Make sure that the board cannot move by placing a couple of rocks to weigh it down if the weather is windy.
Hammer the nail as close to the center of the board as you can. It doesn’t need to go too far in; just enough to make sure that it is sturdy.
Where the shadow of the nail head falls on the surface, make a mark. Ideally, you want to do this at the beginning of the hour: Six o’clock, seven o’clock and so on.
Every half hour or every hour, repeat the process and carry on until sundown.
Without moving the board, draw a line with the ruler connecting the marks to the nail at the center.
You can now tell the time at your longitude and latitude.