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Browse through our recently updated questions and discussion topics.
On the autumnal equinox (Sept.21), where is the Sun on the celestial sphere?
On the autumnal equinox (Sept.21), where is the Sun on the celestial sphere?
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On the autumnal equinox (Sept.  21), where is the Sun on the celestial sphere?

▸ 23. 5° north of the celestial equator

Astronomy   psintusaichol   48   IcerX2050   4 months ago
On a clear night, when an observer in Vancouver sees a first quarter Moon, what would an observer in ...
On a clear night, when an observer in Vancouver sees a first quarter Moon, what would an observer in ...
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On a clear night, when an observer in Vancouver sees a first quarter Moon, what would an observer in St.  John's see?

▸ a new Moon

Astronomy   MrBio23   47   yoorimchi   4 months ago
In which direction does the daily motion of the Moon occur in the sky, against the background stars, ...
In which direction does the daily motion of the Moon occur in the sky, against the background stars, ...
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In which direction does the daily motion of the Moon occur in the sky, against the background stars, when viewed from the Earth?

▸ toward th
Astronomy   got2pass   38   GlitterBug11   4 months ago
In what two seasons does the Milky Way arc from east to west in the sky, as seen from Canada?
In what two seasons does the Milky Way arc from east to west in the sky, as seen from Canada?
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In what two seasons does the Milky Way arc from east to west in the sky, as seen from Canada?

▸ winter and spring

Astronomy   lotusflwr   48   brendasants   4 months ago
In what season is the constellation of Orion most visible in Canada?
In what season is the constellation of Orion most visible in Canada?
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In what season is the constellation of Orion most visible in Canada?

▸ spring

Astronomy   seraphel   34   Deeclaire   4 months ago
In Brazil, in what month does the longest period of daylight occur?
In Brazil, in what month does the longest period of daylight occur?
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In Brazil, in what month does the longest period of daylight occur?

▸ March

Astronomy   JZ240   38   chanelstar27   4 months ago
If you were standing on the Earth's equator, which of the following in the sky would pass through ...
If you were standing on the Earth's equator, which of the following in the sky would pass through ...
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If you were standing on the Earth's equator, which of the following in the sky would pass through your zenith during the entire day (24 hours)?

Astronomy   freezo1994   35   tpriest1   4 months ago
If you were standing at the Earth's North Pole, which of the following would be located at the zenith?
If you were standing at the Earth's North Pole, which of the following would be located at the zenith?
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If you were standing at the Earth's North Pole, which of the following would be located at the zenith?

▸ the nadir

Astronomy   Ryan37sport   49   duhello   4 months ago
If you see the Sun pass directly overhead on at least one day per year, then where are you on Earth?
If you see the Sun pass directly overhead on at least one day per year, then where are you on Earth?
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If you see the Sun pass directly overhead on at least one day per year, then where are you on Earth?

▸ within 23. 5° latitude of the equator
Astronomy   mickied   58   Pmoch   4 months ago
If you lived on the near side of the Moon, how often would the Earth set below your horizon?
If you lived on the near side of the Moon, how often would the Earth set below your horizon?
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If you lived on the near side of the Moon, how often would the Earth set below your horizon?

▸ every 24 hours

Astronomy   spiderman13   31   Marinaanderson0   4 months ago
If the Sun were twice as large but remained at its current distance from Earth, which of the ...
If the Sun were twice as large but remained at its current distance from Earth, which of the ...
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If the Sun were twice as large but remained at its current distance from Earth, which of the following changes would allow people on Earth to still experience a total solar eclipse?

Astronomy   joshtatum92   33   taylor.eihausen   4 months ago
If the perihelion of the Earth was significantly closer to the Sun than is currently the case, what ...
If the perihelion of the Earth was significantly closer to the Sun than is currently the case, what ...
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If the perihelion of the Earth was significantly closer to the Sun than is currently the case, what would be the probable effect on the climate of the Southern Hemisphere?

Astronomy   AL0354335   30   kimtran   4 months ago
If the north celestial pole appears on your horizon, what is your latitude?
If the north celestial pole appears on your horizon, what is your latitude?
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If the north celestial pole appears on your horizon, what is your latitude?

▸ 0°

Astronomy   jwalker824   36   nilabmirzada   4 months ago
If the Moon's orbital plane was aligned with the celestial equator, when would eclipses occur?
If the Moon's orbital plane was aligned with the celestial equator, when would eclipses occur?
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If the Moon's orbital plane was aligned with the celestial equator, when would eclipses occur?

▸ every month

Astronomy   jwalker824   49   Keleko12   4 months ago
If the Moon is setting at noon, what phase must the Moon be in?
If the Moon is setting at noon, what phase must the Moon be in?
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If the Moon is setting at noon, what phase must the Moon be in?

▸ first quarter

Astronomy   cjr4808   48   krissyc39   4 months ago
If the Moon is setting at 6 a. m. , what phase must the Moon be in?
If the Moon is setting at 6 a. m. , what phase must the Moon be in?
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If the Moon is setting at 6 a. m. , what phase must the Moon be in?

▸ full

Astronomy   marcsleiman   58   duankong-fei   4 months ago
If the Earth's rotational axis shifted to a position perpendicular to the ecliptic, what would ...
If the Earth's rotational axis shifted to a position perpendicular to the ecliptic, what would ...
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If the Earth's rotational axis shifted to a position perpendicular to the ecliptic, what would happen to seasonal variations on the Earth?

Astronomy   Neurosciencie   37   jordankites45   4 months ago
If the apparent visual magnitude of star A is 3. 1, and the apparent visual magnitude of star B is ...
If the apparent visual magnitude of star A is 3. 1, and the apparent visual magnitude of star B is ...
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If the apparent visual magnitude of star A is 3. 1, and the apparent visual magnitude of star B is 0. 5, how do star A and star B compare in terms of apparent brightness as seen from Earth?

Astronomy   jack103106   32   miil41   4 months ago
If the apparent visual magnitude of a star is 7. 3, what does this tell us about the brightness of ...
If the apparent visual magnitude of a star is 7. 3, what does this tell us about the brightness of ...
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If the apparent visual magnitude of a star is 7. 3, what does this tell us about the brightness of the star?

▸ It is one of the brighter sta
Astronomy   lbsusugar   55   heathernhull   4 months ago
If someone on Earth observes the Moon in the third quarter phase, what phase would someone on the ...
If someone on Earth observes the Moon in the third quarter phase, what phase would someone on the ...
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If someone on Earth observes the Moon in the third quarter phase, what phase would someone on the Moon facing Earth observe Earth in?

▸ the
Astronomy   booboo123   47   keeton1989   4 months ago
If an observer travels north, toward higher latitudes, how does the number of circumpolar stars that ...
If an observer travels north, toward higher latitudes, how does the number of circumpolar stars that ...
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If an observer travels north, toward higher latitudes, how does the number of circumpolar stars that he or she sees in the sky change?

▸ rem
Astronomy   kristen299   38   HCho0   4 months ago
How much of the night sky lies north of the celestial equator?
How much of the night sky lies north of the celestial equator?
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How much of the night sky lies north of the celestial equator?

▸ Less than half, because of the tilt of the equator to the ecliptic plane.
Astronomy   nursecupcake   33   jjwatson   4 months ago
How much does the RA coordinate of the Sun change in 2 months?
How much does the RA coordinate of the Sun change in 2 months?
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How much does the RA coordinate of the Sun change in 2 months?

▸ 0 hours, it does not change

Astronomy   ejoty   34   LaceyCGibson   4 months ago
How many official constellations are there?
How many official constellations are there?
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How many official constellations are there?

▸ 98

▸ 88

Astronomy   Zergnet   32   anitasag   4 months ago
How long would you have to wait to see a change in the pattern of stars in the night sky?
How long would you have to wait to see a change in the pattern of stars in the night sky?
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How long would you have to wait to see a change in the pattern of stars in the night sky?

▸ several decades

Astronomy   OlKu   52   Quiera730   4 months ago
How far, and in what direction, does the Sun appear to move on the celestial sphere per day?
How far, and in what direction, does the Sun appear to move on the celestial sphere per day?
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How far, and in what direction, does the Sun appear to move on the celestial sphere per day?

▸ about one degree westward

Astronomy   Bapelol   47   dhk72   4 months ago
How does the Moon's appearance change during a total lunar eclipse?
How does the Moon's appearance change during a total lunar eclipse?
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How does the Moon's appearance change during a total lunar eclipse?

▸ The Moon goes from new to full.

Astronomy   lvnrn2012   44   sillysquirrel   4 months ago
Horizon 5The diagram shows three approximate locations of the Sun along the western horizon.Which ...
Horizon 5The diagram shows three approximate locations of the Sun along the western horizon.Which ...
[html]Horizon 5
Astronomy   briemert2013   42   Gimor1220   4 months ago
Horizon 4The diagram shows three approximate locations of the Sun along the western horizon.Which ...
Horizon 4The diagram shows three approximate locations of the Sun along the western horizon.Which ...
[html]Horizon 4
Astronomy   courtneyjuma   48   kingqadri   4 months ago
Horizon 3The diagram shows three approximate locations of the Sun along the western horizon.Which ...
Horizon 3The diagram shows three approximate locations of the Sun along the western horizon.Which ...
[html]Horizon 3
Astronomy   theroyalty   32   shadowblacw   4 months ago
Horizon 2The diagram shows three approximate locations of the Sun along the western horizon.Which ...
Horizon 2The diagram shows three approximate locations of the Sun along the western horizon.Which ...
[html]Horizon 2
Astronomy   denausor   31   tranle311   4 months ago
Horizon 1The diagram shows three approximate locations of the Sun along the western horizon.Which ...
Horizon 1The diagram shows three approximate locations of the Sun along the western horizon.Which ...
[html]Horizon 1
Astronomy   thunter609   45   chevy87   4 months ago
For an observer in Valdivia, Chile, at a latitude of 39 South, what is the angle between the ...
For an observer in Valdivia, Chile, at a latitude of 39 South, what is the angle between the ...
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For an observer in Valdivia, Chile, at a latitude of 39° South, what is the angle between the southern horizon and the south celestial pole?

Astronomy   cheesyboots   51   blf1210   4 months ago
For an observer in Toronto, at a latitude of 44 North, what is the angle between the northern ...
For an observer in Toronto, at a latitude of 44 North, what is the angle between the northern ...
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For an observer in Toronto, at a latitude of 44° North, what is the angle between the northern horizon and the north celestial pole?

▸ 23. 5
Astronomy   HoracioMo   45   smiller94107   4 months ago
For an observer in Pond Inlet, Nunavut, at a latitude of 73 North, what is the angle between the ...
For an observer in Pond Inlet, Nunavut, at a latitude of 73 North, what is the angle between the ...
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For an observer in Pond Inlet, Nunavut, at a latitude of 73° North, what is the angle between the northern horizon and the north celestial pole?

Astronomy   Kss612   41   marlboroman   4 months ago
For an observer in Oberon Bay, Australia, at a latitude of 39 South, what is the angle between the ...
For an observer in Oberon Bay, Australia, at a latitude of 39 South, what is the angle between the ...
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For an observer in Oberon Bay, Australia, at a latitude of 39° South, what is the angle between the southern horizon and the south celestial pole?

Astronomy   lovepink1122   32   crwille78   4 months ago
For an observer in New Delhi, India, at a latitude of 28 North, what is the angle between the ...
For an observer in New Delhi, India, at a latitude of 28 North, what is the angle between the ...
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For an observer in New Delhi, India, at a latitude of 28° North, what is the angle between the northern horizon and the north celestial pole?

Astronomy   cjr4808   35   JulzMarie   4 months ago
For an observer in Lusaka, Zambia, at a latitude of 16 South, what is the angle between the southern ...
For an observer in Lusaka, Zambia, at a latitude of 16 South, what is the angle between the southern ...
[html]

For an observer in Lusaka, Zambia, at a latitude of 16° South, what is the angle between the southern horizon and the south celestial pole?

Astronomy   yojoe102   36   miil41   4 months ago
For an observer at the North Pole, what is the angular distance between a star at a declination of ...
For an observer at the North Pole, what is the angular distance between a star at a declination of ...
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For an observer at the North Pole, what is the angular distance between a star at a declination of +30° and the zenith?

▸ 30°

Astronomy   hellokidbye   36   ydnam23   4 months ago
During the month of June, the north celestial pole points towards Polaris; where does it point ...
During the month of June, the north celestial pole points towards Polaris; where does it point ...
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During the month of June, the north celestial pole points towards Polaris; where does it point during the month of December?

▸ just south of
Astronomy   nsdq007   37   enzee   4 months ago
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