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45 Cards in this Set
- Front
- Back
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How many stars are visible at any time from Earth?
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3000
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A grouping of stars creating an image.
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ASTERISM
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A region of the sky often containing one major image.
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CONSTELLATION
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The current north star.
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POLARIS
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The "map" of the night sky.
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CELESTIAL SPHERE
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Degrees north or south of the celestial equator.
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DECLINATION
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Similar to longitude on Earth.
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RIGHT ASCENSION
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Hours/minutes/seconds east of the Sun's position at spring equinox.
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RIGHT ASCENSION.
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Similar to latitude on Earth.
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DECLINATION
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The daily motion of Earth, from noon to noon.
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DIURNAL
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The length of time for Earth's daily motion, from noon to noon.
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SOLAR DAY
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Marked by the highest position of the Sun during the day.
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SOLAR NOON
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Causes day and night.
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ROTATION
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Length of one revolution.
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365.25 days
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Length of one rotation.
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24 hours
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Plane of Earth's path around Sun.
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ECLIPTIC
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The closest point of an orbit to the central object.
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PERIHELION
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The furthest point of an orbit to the central object.
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APHELION
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Causes the seasons.
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1) TILT OF EARTH ON ITS AXIS
2) POSITION IN ORBIT |
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A day with approximately equal periods of light and dark.
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EQUINOX
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The day with the least amount of daylight.
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WINTER SOLSTICE
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The day with the most amount of daylight.
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SUMMER SOLSTICE
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The 12 constellations through which the Sun appears to move.
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ZODIAC
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The day where the Sun reaches the northernmost point.
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SUMMER SOLSTICE
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The day where the Sun reaches the southernmost point
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WINTER SOLSTICE
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The day where the Earth's orbit crosses the celestial equator.
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EQUINOX
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Time from one vernal equinox to another.
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TROPICAL YEAR
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A rotation or wobble of Earth's axis.
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PRECESSION
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Why is Polaris eventually no longer going to be the north star?
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PRECESSION
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Time for Earth to orbit once around Sun relative to fixed stars.
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SIDEREAL YEAR
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A year based on constellations.
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SIDEREAL
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A year based on seasons.
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TROPICAL
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Number of timezones on Earth.
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24
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Reason for timezones on Earth.
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24 hours in rotation.
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One complete lunar cycle.
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LUNAR MONTH
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Number of days in a lunar cycle.
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29.5
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Number of days in one rotation of the Moon.
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29.5
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Number of days in one revolution of the Moon
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29.5
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Time of year Earth is closest to the Sun.
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JANUARY
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Reason for leap year.
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EXTRA 0.25 days/year
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Another name for a lunar month.
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SYNODIC MONTH
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Period of time of Moon's position to complete one cycle compared to stars.
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SIDREAL MONTH (27.3 days)
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Why solar day is unequal to sidereal day
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EARTH'S REVOLUTION
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Why synodic moth is unequal to sidereal month
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EARTH'S REVOLUTION
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Why tropical year is unequal to sidereal year
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PRECESSION
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