The point in the Moon’s orbit that is farthest from Earth.

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Cirrocumulus cloud

Thin cloud that appears as small "cotton patches."


9 inches; derived from the distance between the end of the thumb and the end of the little finger when both are outstretched.

Mean temperature

The average of the maximum and the minimum temperatures for a particular period; the mean equals the sum of the max and min divided by two.


Daily; refers to events which recur every 24 hours, such as a daily temperature cycle.


Originally, a laborer on canals for internal navigation; hence, a laborer on other public works, as in building railroads, embankments, etc.


A soft return in tennis. The tennis ball will drop abruptly after crossing the net.

Lunar eclipse

The full Moon enters the shadow of Earth, which cuts off all or part of the Moon’s light. Total: The Moon passes completely through the umbra (central dark part) of Earth’s shadow. Partial: Only part of the Moon passes through the umbra. Penumbral: The Moon passes through only the penumbra (area of partial darkness surrounding the umbra).

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