Phases of the Moon. Day side of the Earth. Night side of the Earth

Transcription

1 Phases of the Moon Day side of the Earth Night side of the Earth

2 Phases of the Moon Day side of the Earth Night side of the Earth

3 Phases of the Moon sunset Day side of the Earth Night side of the Earth sunrise

4 How we see the moon from Earth Phases of the Moon Phases of the moon alter as the moon revolves around Earth. New Moon we only see the night-side of the moon during our daytime.

5 How we see the moon from Earth Phases of the Moon Waxing Crescent we see only a sliver of the moon s day-side around our sunset

6 How we see the moon from Earth Phases of the Moon Waxing Crescent we see only a sliver of the moon s day-side around our sunset

7 How we see the moon from Earth Phases of the Moon Waxing Crescent we see only a sliver of the moon s day-side around our sunset

8 How we see the moon from Earth Phases of the Moon Waxing Crescent we see only a sliver of the moon s day-side around our sunset

9 How we see the moon from Earth Phases of the Moon Waxing Crescent we see only a sliver of the moon s day-side around our sunset

10 How we see the moon from Earth Phases of the Moon First Quarter Moon the moon has completed 1/4 of its orbit around Earth from New Moon phase, 90 o /perpendicular to sun in sky

11 How we see the moon from Earth Phases of the Moon First Quarter Moon the moon has completed 1/4 of its orbit around Earth from New Moon phase, 90 o /perpendicular to sun in sky

12 How we see the moon from Earth Phases of the Moon Waxing Gibbous more than 50% of the moon s surface (from Earth s vantage point) appears illuminated

13 How we see the moon from Earth Phases of the Moon Waxing Gibbous more than 50% of the moon s surface (from Earth s vantage point) appears illuminated

14 How we see the moon from Earth Phases of the Moon Waxing Gibbous more than 50% of the moon s surface (from Earth s vantage point) appears illuminated

15 How we see the moon from Earth Phases of the Moon Full Moon we see the entire day side of the moon during our night. Moon is 180 o opposite the sun in the sky (highest in sky at midnight)

16 How we see the moon from Earth Phases of the Moon Waning Gibbous we see most of the day-side of the moon during our night (peaks after midnight)

17 How we see the moon from Earth Phases of the Moon Waning Gibbous we see most of the day-side of the moon during our night (peaks after midnight)

18 How we see the moon from Earth Phases of the Moon Third Quarter Moon moon has completed 3/4 of its orbit around Earth. Peaks in sky at sunrise

19 How we see the moon from Earth Phases of the Moon Waning Crescent we see only a sliver of the moon s day-side around our sunrise

20 How we see the moon from Earth Phases of the Moon Waning Crescent we see only a sliver of the moon s day-side around our sunrise

21 How we see the moon from Earth Phases of the Moon Waning Crescent we see only a sliver of the moon s day-side around our sunrise

22 How we see the moon from Earth Phases of the Moon Waning Crescent we see only a sliver of the moon s day-side around our sunrise

23 How we see the moon from Earth Phases of the Moon Waning Crescent we see only a sliver of the moon s day-side around our sunrise What time of day or night will the 1st quarter moon set? A. Around Sunset B. Around Midnight C. Around Sunrise D. Around Noon

24 Earthshine In some instances, light is reflected off the Earth to the moon and back. So the dark side of the moon can be seen. This usually occurs around the crescent phase at sunset. Image credit: M. Taha Ghouchkanlu

25 Does the moon rotate about its axis? Do we see all of its surface? Discuss

26 Does the moon rotate about its axis? Do we see all of its surface? Discuss The moon rotates one full revolution per orbit so we always see the same face. This is called tidal locking. Most moons in the solar system and many planets around other stars share this behavior. Other examples of tidally-locked bodies exist in the Solar System. Pluto and its moon Charon are both tidally locked to each other.

27 Planetary Alignment is this a miracle or pretty usual? Discuss.

28 Planetary Alignment is this a miracle or pretty usual? The planets are ALWAYS in alignment, whether or not we can see them, because they sit in the disk of the solar system. Discuss.

29 BODIES IN THE SOLAR SYSTEM OCCUPY ONLY A CERTAIN PART OF THE SKY The ECLIPTIC = The plane of the Solar System s Disk as viewed from Earth

30 Where is the sun in this diagram?

31 Where is the sun in this diagram? Ecliptic

32 Where is the sun in this diagram? Ecliptic

33 Why can t it be over here? Ecliptic

34 Why can t it be over here? Ecliptic

35

36

37

38 Mercury & Venus close to the sun in the sky as seen from Earth: they always appear near sunrise or sunset

39 Mercury & Venus close to the sun in the sky as seen from Earth: they always appear near sunrise or sunset You can calculate the maximum angle of Mercury (a = AU) and Venus (a = AU) in the sky. This angle is called elongation.

40

41 Outter planets (Mars - Neptune) could appear any time of day or night based on their relative position in their orbits w.r.t. Earth

42 Which photograph of Venus and the Moon is real, which is fake, and why? Photograph A Photograph B

43 THE ZODIAC What is it? The stars of the constellations that fall on the ECLIPTIC. If it is January, time of Capricorn then we know the sun is currently in the constellation of Capricorn (which we can t see because it s daytime)

44 THE ZODIAC What is it? The stars of the constellations that fall on the ECLIPTIC. If it is January, time of Capricorn then we know the sun is currently in the constellation of Capricorn (which we can t see because it s daytime) Next time: SEASONS & Eclipses.

45 What we have learned Structure of the Celestial Sphere & how to map the sky: Altitude / Azimuth, and Right Ascension / Declination Causes of the phases of the moon. Planetary Alignment in the Sky: the Ecliptic and the zodiac.