Flashcards
science
Flashcards do conjunto (46)
- 1The Sun's ___ is zero on the vernal equinox or autumnal equinox, so the sun is above the horizon for exactly ___ hours.1) declination
2) 12 Hours - 2What does the term equinox mean?Equal Night
- 3What does the term solstice mean?sunstop
- 4Anyone observing from the__ Circle will experience 24 hours of sunlight on the summer solstice.Artic
- 5In the Northern Hemisphere, days are longer in the __ and ___ seasons, and shorter in the __ and _ seasons.1)Spring and Summer
2) Summer and Winter - 6The Moon is roughly in the ___, not the celestial equator.Ecliptic
- 7Stars with declination that is less than your latitude will pass ___ of zenith when they cross the meridian; and stars with a greater declination will pass ___ of zenith1) South
2) North - 8Which RA coordinates can be seen depends on the time of _ and the time of _1) Day
2) year - 9Once calibrated on an object whose RA and Dec you know, you can use ___ circles on a telescope to find any other RA or dec.Setting
- 10What is the best way to get a feel for the motions in the sky?Go outside and watch
- 11A star wheel or planisphere helps you find stars by lining up the ___ with the __ on the planisphere.1) Date
2) Time - 12A planisphere helps find constellations, but will not help with ___ or the ___.1) Planets
2) The Moon - 13Describe the difference between the sidereal day and the solar day.Sidereal- Goes off of star time
Solar- Goes off of Sun time - 14Since stars rise two hours earlier every month, they rise ___ hours earlier after six months.12 hours
- 15Why is it difficult to observe planets, globular clusters, and nebulae when the moon is full?Because it is so bright that it makes everything else unseeable.
- 16The moon rises on average, about ___ later each day.50 Minutes.
- 17Why is it ironic that the moon is called "the moon" in regards to the gravitational pull of the earth and sun?Because the pull of the moon to the earth is two times less than the earth's pull to the sun.
- 18The phases of the moon are not related to the earth's shadow, but to the ___ of the day side of the moon we can see from our position.Percentage
- 19It takes ___ days for the moon to go through it's phases, and __ days for its orbital period.1) 29.3 days
2) 27.5 days - 20Why is there a trend of east-to-west motion when observing the sun, moon, and stars?Because of earth's rotation on it's axis, it is spinning the opposite direction.
- 21What is the trend of the earth's rotation called?Diurnal motion
- 22What is the approximate time of the earth that relates to other objects in the sky as well?24 hours
- 23Name the concept that is useful for understanding the positions and motions of the stars,The Celestial Sphere
- 24Name the concept the involves expanding the earth's equator into space.The Celestial Equator
- 25Whare are constellations called that are close enough to the celestial pole that they are visible all night, year-round?Circumpolar constellations
- 26Since the 23 hours and 56 minutes period is the length of time it takes the earth to turn as seen from a distant star, this is called a "____."Sidereal day
- 27When will the first quarter moon make its highest arc in the sky?On the spring equinox
- 28There are two kinds of eclipses: A ___ eclipse, when the moon's shadow falls on the earth, and a ___ eclipse, when the earth's shadow falls upon the moon.1) Solar
2) Lunar - 29the term "___" is the generic term for the two points of intersection on any two great circles.Node
- 30The configuration of the sun, moon, and Earth is about the same every 18.031 years, and is called the ___ cycle.Saros cycle.
- 31The earth actually had two shadows, a dark inner shadow called the ___ and a lighter outer shadow called the ___1) Umbra
2)Penumbra - 32During a total solar eclipse, the bright surface of the sun (the ____) is completely blocked by the moon.Photosphere
- 33Any given spot on the earth experiences a total solar eclipse once every ___ years or so.400 years
- 34The motion of the planets is complicated because their apparent motion in the sky is the combination of their ___ around the sun, plus the ___ in position due to Earth's motion around the sun.1)True Motion
2)Apparent Shift - 35What is responsible for the reason on Earth?The Earth's rotation axis
- 36Describe what the two coordinate systems widely used in astronomy are based on.1) The local horizon- describes the position of an object in the sky with two coordinates : Altitude and azimuth.
2)The equatorial System- Their coordinate is based on the celestial sphere. It measures stars and such. - 37___ describes how high above the horizon an object is (in angle).Altitude
- 38____ describes how far along the horizon an object is to the right of due north.Azimuth
- 39Equatorial coordinates are based on the _____. In particular, they are based on the celestial ____.1) Celestial Sphere
2) Equator - 40When the moon is father from the earth, it appears smaller than the sun, and when it passes directly in front of the sun it leaves a thin "ring" or "_____".Annulus
- 41The moon seems to wobble a bit from week to week, which is called "___________."Liberation
- 42Planets orbit the sun in slightly _____ paths with the sun at once focus of the ellipse.Elliptical.
- 43The ____ planets are Mars, Jupiter, Saturn, Uranus, and Neptune.Superior
- 44_____ is when a planet is "behind" the sun.Conjunction
- 45All the planets orbit the sun in the same direction:________Counterclockwise
- 46____ and ____ are two inferior planets whose orbits lie closer to the sun than Earth does.Mercury and Venus.
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- FlashCards sobre science, criado por gracetoth em 29-09-2015.
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