On the 21st of June there are therefore two maxima of insolation, one at lat.
They also have the minimum amount of insolation for the whole year.
The tropical zone has the least annual variation of insolation.
Length of the period of basking is determined not only by amounts of insolation and temperature but also by the size of the snake.
These last conditions can be readily traced to the effects of insolation and radiation near the ground.
The intensity and seasonal distribution of insolation are prime factors on which many important results hinge.
In water not subjected to insolation anthrax spores were found to retain their vitality for several months.
It was found that typhoid, cholera, and various other bacilli were most deleteriously affected by insolation.
At the pole there is one maximum at the summer solstice, and no insolation at all while the sun is below the horizon.
Hence the amount of insolation received at this latitude is greater than that received on the equinox at the equator.