The MOON Slide 2 Earths rotation 1 mean solar day (Looking down
on Earths N pole) Slide 3 The MOON Earths rotation 1 mean solar day
moons orbital period 29 days (synodic month) A complete cycle of
lunar phases i.e. orbit w.r.t. the sun. Note right-hand rule again
Slide 4 The MOON 1 week moons orbital period month 1 week Quarters
Slide 5 The moons phases Slide 6 Moon as seen from earth E W New
ESun W Cant see anything of the moon! (Unless theres an eclipse!)
Slide 7 Moon as seen from earth E W New(ish) ESun W Sun rises
first, then the crescent moon. Moon is near the sun, and to the
east. Slide 8 Moon as seen from earth E W Waxing Crescent ESun Sun
rises first, then the moon. Moon is farther from the sun, but still
to the east. W Slide 9 Moon as seen from earth E W 1 st Quarter
ESun Sun rises first, then the moon W moon is 90 East of sun now!
moon due south 6PM Slide 10 Moon as seen from earth E WESun Sun
rises first, then the moon. At some point this week, the moon
starts to rise after the sun sets W Waxing Gibbous Slide 11 Moon as
seen from earth E WE Moon would be due south midnight W Full Slide
12 Moon as seen from earth E WE Moon would be to the south after
midnight. W Waning Gibbous Sun Slide 13 Moon as seen from earth E
WE W 3 rd Quarter moon rises first, then the sun moon is 90 west of
sun now! Moon due south 6AM Sun Slide 14 Moon as seen from earth E
WE W Waning Crescent moon rises first, then the sun shortly
thereafter Sun Slide 15 The terminology: Waxing = getting bigger OR
Waning = getting smaller Crescent = less than OR Gibbous = bigger
than Wayne-ing Wain-ing Slide 16 new 1 st full 3 rd Slide 17 Waxing
or waning ? (Northern hemisphere) horizon Slide 18 Waxing or waning
? (Northern hemisphere) premier? dernier? bloating? diminishing?
horizon (fr: last) Slide 19 Waxing or waning ? (Northern
hemisphere) premier? dernier? bloating? diminishing? horizon (fr:
first) Slide 20 start 12 synodic months later +10 days Slide 21
Easter? VBA Function For Easter The date of Easter can be computed
in VBA. The algorithm below is from the United States Naval
Observatory, at Computing The Date Of Easter.Computing The Date Of
Easter Public Function EasterUSNO(YYYY As Long) As Long Dim C As
Long Dim N As Long Dim K As Long Dim I As Long Dim J As Long Dim L
As Long Dim M As Long Dim D As Long C = YYYY \ 100 N = YYYY - 19 *
(YYYY \ 19) K = (C - 17) \ 25 I = C - C \ 4 - (C - K) \ 3 + 19 * N
+ 15 I = I - 30 * (I \ 30) I = I - (I \ 28) * (1 - (I \ 28) * (29 \
(I + 1)) * ((21 - N) \ 11)) J = YYYY + YYYY \ 4 + I + 2 - C + C \ 4
J = J - 7 * (J \ 7) L = I - J M = 3 + (L + 40) \ 44 D = L + 28 - 31
* (M \ 4) EasterUSNO = DateSerial(YYYY, M, D) End Function You can
call this from a worksheet cell with a formula like
=EasterUSNO(YYYY) 325 A.D. The first Sunday after the full moon
(the Paschal Full Moon*) following the northern hemisphere's vernal
equinox. *14th day of a lunar month Slide 22 The moons Synchronous
orbit Slide 23 The MOON: an odd fact Earths rotation 1 mean solar
day moons orbital period 29 days (synodic) moons rotational period
29 days too! Slide 24 Q: Coincidence? A: No! Slide 25 The Lunar
day: Moons rotational period 29 earth days! Length of Day/night on
moon 14 3/4 days Slide 26 Eclipses The moons orbital plane is
inclined relative to the ecliptic! (by about 5) Solar eclipse: Moon
in front of Sun Lunar eclipse: Earth shades the Moon Sun and moon
appear to have the same size ( ) These are Rare events because:
Slide 27 Missing a lunar eclipse: max relative tilt: 5 earths
shadow (1 st guess) Slide 28 Missing a solar eclipse: max relative
tilt: 5 apparent solar disk Slide 29 Slide 30 Slide 31 Lunar
eclipses, the earths shadow sun earth PENUMBRA UMBRA Slide 32 An
observer within the penumbra would see sun earth Slide 33 sun earth
An observer within the umbra would see Slide 34 sun earth An
observer beyond the umbra would see Slide 35 to scale . sun earth
moon PENUMBRA UMBRA Slide 36 5 1 sun earthmoon to scale . Slide 37
Slide 38 Slide 39 Solar eclipses, the moons shadow sun earth moon
PENUMBRA UMBRA Slide 40 Slide 41 Slide 42 Slide 43 The PLANETS
Slide 44 Slide 45 Slide 46 Slide 47 Slide 48 E W Slide 49 E W Slide
50 E W Slide 51 E W Slide 52 E W Slide 53 E W Slide 54 E W Slide 55
E W Slide 56 E W Slide 57 E W Slide 58 E W Slide 59 E W Slide 60
Using a telescope!!
