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63 Cards in this Set
- Front
- Back
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To convert from local time to Eastern time for EL...
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...add 38 minutes
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A star found half way up in the SW sky is at what altitude and azimuth?
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Alt 45, Az 225
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Az of N
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0 degrees
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Az of E
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90 degrees
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Az of S
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180 degrees
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Az of W
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270 degrees
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Azimuth increases to the...
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...East
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Azimuth starts at...
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...N
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What units is right ascension measured in?
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Hours
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What units is declination measured in?
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degrees
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RA and dec. of first day of autumn
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RA 12h, dec 0 deg.
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RA and dec. of first day of winter
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RA 18h, dec -23.5 deg.
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RA and dec. of first day of spring
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RA 0h, dec. 0deg.
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RA and dec. of first day of summer
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RA 6h, dec. +23.5 deg.
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How far away from the sun (in hours) is a point opposite from the sun?
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12 h
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The sun always is on...
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...the eliptic
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the eliptic traces...
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...the plane of the earth's orbit
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what is the position of the planets relative to the plane of the earth's orbit?
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they nearly follow it
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what is the position of the moon's orbit relative to the plane of the earth's orbit?
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it stays close to the earths orbit, and crosses occasionally
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the midday altitude of the sun on the first day of summer is...
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...70 deg.
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the midday altitude of the sun on the first day of winter is...
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...about 30 deg.
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the midday altitude of the sun on the first day of spring is...
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...about 50 deg.
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the midday altitude of the sun on the first day of autumn is...
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...about 50 deg.
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From EL, a star whose dec. is 0 rises approx...
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... due E
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altitude is measured in...
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...deg.
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azimuth is measured in...
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...deg.
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right ascension
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arcs parallel to the celestial equator (E to W)
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2 parts of celestial coordinate system
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RA, dec.
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declination
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lines that run north to south
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where is the declination zero?
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at the celestial equator
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meridian
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connects N, S, zenith
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the ____ goes through the N celestial pole
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meridian
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transit
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crossing meridian
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what 2 astronomial terms are the same?
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midday, local noon
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zenith connects....
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...meridian and celestial equator
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celestial equator
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connects E, W, and zenith
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RA changes ____ per month
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2 hours
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rising/setting points ____ about meridian
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symmetric
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something that rises in SE will set in...
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...SW
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what 2 places can you generally find the planets and the moon?
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on the ecliptic (in the zodiac)
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where is the sun located on the planishpere at the equinoxes
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at the crossing of the 2 major arcs
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the altitude and azimuth, respectively, of an object located a quarter of the way up in the NE is
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22.5 deg., 45 deg.
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an object with declination +30 will set approx. where?
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NW
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if the sky is set so that 0h of RA is on the W horzon, what approx. RA is on the meridian?
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6h
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to convert from eastern to local for EL
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subtract 38 min
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zodiac is always on...
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...ecliptic
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moon stays close to...
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...eliptic
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zenith distance (obj) + altitude (obj)=
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90 deg.
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latitude is equal to which two things?
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altitude of NCP, and zenith distance of celestial equator
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latitude + altitude =
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90 deg.
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declination is equal to
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distance away from celestial equator
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latitude is always...
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...N
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for longitude, ___ is CW, ___ is CCW
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W, E
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clockwise times for longitude
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12pm, 6pm, 12am, 6am
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longitude is...
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...degrees L is away from G
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to find LMT...
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mark 12pm over local time, LMT is time corresponding to time at point with sun
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to find LST...
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Set RA as 0 at vernal equinox, increases CCW to local point
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sun is ____ in March
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on VE
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sun is ____ in June
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6 CCW from VE
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sun is ____ in Sept.
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12 CCW from VE
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sun is ____ in Dec.
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18 CCW from VE
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If a star with an RA of x transited y hours ago, the LST is...
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x + y
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The LST is xh. y hours later, the RA of the star will be...
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xh
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