1) Latitude
2) Longitude
Latitude is easy to exactly find out.
Calculating latitude, tropic of cancer and equator
α is exact same degree of sun shadow
Longitude is completely arbitrary
How to keep the time?
-Need Periodicity
We need chronometer
-periodic, isochronous, predictable
Equilibrium
c = 2πr
2πradians = 360°
cos(3π/4)=-0.707
Sin(3π/4)=0.707
Angular Velocity w
ΔΘ=ωt
