Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

11 Cards in this Set

  • Front
  • Back
Spin on an axis.
The orbiting of one body around another
Of an orbit, the angle of the plane of the orbit with respect to the ecliptic plane.
Summer and Winter Solstice
The point on the celestial sphere of northernmost or southernmost declination of the Sun in the course of a year; colloquially, the time when the Sun reaches that point.
Vernal and Autumnal Equinox
An intersection of the ecliptic and the celestial equator. The center of the Sun is geometrically above and below the horizon for equal lenghts of time on the two days of the year when the Sun passes the equinoxes; if the Sun were a point and atmospheric refraction were absent, then day and night would be of equal length on those days.
One of the four natural divisions of the year, spring, summer, fall, and winter, in the North and South Temperate zones. Each season, beginning astronomically at an equinox or solstice, is characterized by specific meteorological or climatic conditions.
Astromical Unit
A unit of length used in measuring astronomical distances within the solar system equal to the mean distance from Earth to the sun, approximately 150 million kilometers (93 million miles).
adj : (of the moon) becoming full; "the waxing moon passes from new to full"
To decrease gradually in size, amount, intensity, or degree; decline.
a) Of a sunspot, the dark central region

b) Of an eclipse shadow, the part from which the Sun cannot be seen at all.
a) For an eclipse, the part of the shadow from which the Sun is only partially occulted;

b) Of a sunspot, the outer region, not as dark as the umbra