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Speed of Light
- 300,000 km/sec or 186,000 miles/sec - fastest speed known
Light from the Sun reaches Earth in ____
8min
Light from the Sun reaches Pluto in ____
5 hours 30 mins
Nearest Star
Proxima Centauri - 4.2 light years away
Diameter of the Milky Way
100,000 light years
Sun rises in the ___, and sets in the ___
Sun rises in the east, and sets in the west
Moon, planets and stars rise in the ___ and set in the ____
Moon, planets and stars rise in the east, and set in the west
The cycle of day and night goes with ___
The cycle of day and night goes on with the rising and setting of the Sun
Seasons ___ throughout the year
Seasons change throughout the year
Constellations ___ throughout the year
Constellations change throughout the year
Rotation
Earth spins on its axis - 24 hours - Day to day changes: formation of day and night
Revolution
Earths orbit around the sun - 365.25 days - Seasonal changes: winters and summers
Astronomy
study of the entire universe
Universe
totality of all space, time, matter and energy
Day
Earth's rotation
Month
Moon's revolution around Earth
Year
Earth's revolution around the Sun
Astronomy: importance and usefulness
- Time - Calender - Religion - Artificial satellites (communication) - Physics/Chemistry/Geology/Geophysics/Biology - Event predictions (eclipse, meteor showers etc.) - Celestial Navigation (one's position on Earth)
How many stars are there in our Solar System?
One (Sun)
How many stars are in our galaxy?
Billions
Is the Milky Way a part of our Solar System?
False
Arrange the Sun, the Moon, Stars, and Pluto in order to most distance from Earth?
Earth, Moon, Sun, Pluto, Stars
In what direction does our Earth spin?
West to East
The formation of Seasons is due to?
- Earth's orbital motion - Tilt of Earth's axis to the ecliptic
When is Earth closest to the Sun?
January
Vernal/Spring Equinox
- March 21st - Sun crosses the celestial equator moving North - Equal day and night on the entire Earth
Summer Solstice
- June 21st - Sun is in northernmost point - Longest day in the Northern hemisphere - 24 hours of daylight in the Arctic regions near the North Pole - 24 hours of nighttime in the Antarctic regions near the South Pole
Autumnal/Fall equinox
- September 21st - Sun moves into the Southern Hemisphere - Equal day and night on the entire Earth
Winter Solstice
- December 21st - Sun is at the southernmost point - The shortest day in the Northern hemisphere - 24 hours of night in the Arctic regions near the North Pole - 24 of daylight in the Antarctic region near the South Pole
Subsolar Point
The location on Earth where the Sun rays come directly, at an angle of 90 degrees
1º (degree) = _____
60 minutes
Arcminute
1 1' = ------- degrees 60
Constellations
- Names based on Greek astronomy (brightest stars having proper names from antiquity of Arbic or Latin orgin)
Celestial Equator is at ____ declination
0º declination
Lines of Right Ascension
Run from North to South from 0 hours and 0 minutes around glove to 23 hours 59 minutes
Lines of Declination
Run around the globe in concentric circles from -90º at the South Celestial Pole to +90º at the North Celestial Pole
New Moon is at __º
Waxing Crescent is at ___º
0º to 90º
Full Moon is at ___º
180º
3rd Quarter Moon is at ___º
270º
1st Quarter Moon is at ___º
90º
Waxing Gibbous is at __º
90º to 180º
Waning Gibbous is at __º
180º <
When the Moon is on the right side it's the ___ cycle
Waxing cycle
When the Moon is on the left side it's the ___ cycle
Waning cycle
What time does our solar eclipse occur?
Anytime from sunrise to sunset

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