Ponto subsolar

Coordenadas do ponto subsolar

O ponto subsolar se move constantemente na superfície da terra, mas por qualquer tempo, suas coordenadas, ou latitude e longitude, podem ser calculadas da seguinte forma:

Onde

ϕ s {\displaystyle \phi _{s}} is the latitude of the subsolar point in degrees, λ s {\displaystyle \lambda _{s}} is the longitude of the subsolar point in degrees, δ {\displaystyle \delta } is the declination of the Sun in degrees, T G M T {\displaystyle T_{\mathrm {GMT} }} is the Greenwich Mean Time or UTC, E m i n {\displaystyle E_{\mathrm {min} }} is the equation of time in minutes.

Observação em locais específicos

Qibla observation by shadows, when the subsolar point passes through the Ka'bah in Saudi Arabia, allowing the Muslim sacred direction to be found by observing shadows.When the point passes through Hawaii, which is the only U.S. state in which this happens, the event is known as Lahaina Noon.