×

# Where do the sun's rays strike Earth most directly and least directly?

Jan 15, 2017

Least-direct- inclination : latitude + ${23.4}^{o}$.
Most-direct-inclination : latitude-- ${23.4}^{o}$
See explanation.

#### Explanation:

In a period of 1 year, the angle of incidence of solar rays at latitude

${\theta}^{o} \left(N \mathmr{and} S\right)$ oscillates in ${\left[\theta - 23.4 , \theta + 23.4\right]}^{o}$.

South or north of the equator,, it is direct over-head strike, twice in a

year, if the

latitude $\le$ the obliquity ( tilt angle of the polar axis ) = ${23.4}^{o}$,

nearly.