l lang="en" style="font-size: 14px;">stclairdrake.net 110G: distance EducationWe space looking under on the solar system, from above the phibìc Pole. The Earthrotates ~ above its own axis counterclockwise as soon as a work (you can verify this bychecking that the sun will appear to increase in the east at dawn and set in thewest at dusk), and also the Moon orbits counterclockwise approximately the earth once amonth.The Moon has been drawn in that is eight major phases. In every case, a figure(
) placed listed below the Moon top top the surface of theEarth mirrors where one would stand to watch the Moon straight overhead, and also thetime of day or night is identified. You have the right to imagine the the earth is thecenter that a large clock, and also as you stand on that you sweep through 24 (not12!) hours with every full circle, creating our night and also day cycle.
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The Moon is always half illuminated (the side facing the Sun), and fifty percent inshadow (the side covert from the Sun). Where have to the Moon it is in (relative tothe Earth) so that we watch the portion of the illuminated next correspondingto the correct lunar phase? What time is that if you are on the next of theEarth directly underneath this point?The complying with table perform the eight significant phases the the Moon. It mirrors theappearance the the Moon native Earth, and the time that night or day in ~ which theMoon will certainly be directly overhead because that each phase. Test your knowledge bylooking at every phase, and comparing the illustration of the Moon in the tablewith the fraction of the Moon which is illuminated which have the right to be checked out fromEarth (as deduced from the over figure).
|Full ||Waning gibbous ||Third 4 minutes 1 ||Waning crescent ||New ||Waxing crescent ||First 4 minutes 1 ||Waxing gibbous |
| || || || || || || |
|12am || 3am || 6am || 9am ||12pm || 3pm || 6pm || 9pm|
You may assume the it is noon as soon as the sunlight is directly overhead in the sky,6pm in ~ sunset, midnight as soon as the sun is most covert behind the Earth, and 6amat sunrise. (Don"t worry around daylight save time, and also remember the 12pmis noon, and also 12am is midnight.)When considering rising and setup times, you must think about when theMoon will show up on the horizon. The is important to realize the in thefigure above, we have drawn the Earth and the Moon much bigger than theyreally are so the they will be easy to see. In the figure below, this strategy is repeated on the left. In the figure onthe right, however, us have attracted the Earth and Moon at your actual size(keeping the distance in between the Earth and also the Moon constant). If you onlylooked in ~ the figure on the left, you might be tempted to say the the personneeded come rotate ago a couple of degrees (rather climate standing directly up), together isshown, in order to check out the Moon top top the horizon. The figure on the rightshould reassure you that since the Earth and Moon room both much smaller thanthe distance in between them, you can see the Moon on the horizon as soon as it lies afull quarter-turn far from you.
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You have the right to assume the the Moon will certainly lie above the horizon because that twelve hours outof every day, and will be surprise on the various other side of the planet for twelvehours out of every day. It appears on the eastern horizon, progressively risesthrough the skies for six hrs until the reaches the maximum elevation in the sky(transits), and then progressively sets for six hours until it falls listed below thewestern horizon. The Moon will lie overhead six hrs after rising, and also willset six hours after the is overhead.We trace this this pattern the end for the full Moon below. That rises majesticallyabove the east horizon at about dusk, ascends v the skies untiltransiting at midnight, and also then slowly sets towards the west horizon,reaching it at dawn.