Voyager demos
1.
Moon -- 180 deg -- 2:30 16 Sept. --Rose 2 hr ago, i.e. when sun at high noon
just passed between Mars and Pluto
in Sagittarius (zody const.)
zoom -- not quite to 1st quarter
back to 180 zoom -- go forward 2 days -- crosses ecliptic 20 Sept. not new or full so no eclipses
2.
Jupiter 10:30 PM 16 Sept. to east -- 120 degrose 2.5 h ago -- Saturn trailing ~ 1 h
-2.4 mag, easily visible -- center and zoom
4 Galilean satellites -- all in a line -- aligned with ecliptic, also Jupiter’s equator
Galileo saw this first -- followed their orbits -- supported Copernican idea that earth orbits sun
picture HST scars from Shoemaker Levy
5th picture, only clear view of impact (million megaton) from Galileo spacecraft
unzoom and center on Saturn -- 1st mag
zoom in -- rings are also aligned with ecliptic. Saturn tilted 20 deg, like earth
4th picture -- best from Voyager -- 3 small satellites and one shadow (solar eclipse!)
3.
Venus -- 5 AM -- rose about 2 h ago -- -3 mag -- brighter than alpha Canis Majoris (Sirius)morning star
center and zoom in -- venus in crescent phase -- Galileo saw this and argued venus orbits sun
can see crescent with good binos
run 1d/step to see phases of Venus
venus gets smaller and more full -- further from Earth
Full phase -- on opposite side of sun from earth
waning gibbous -- venus gets larger -- now an evening star
crescent, then crosses in front of sun (new phase)
stop May 2001 -- back to present phase (i.e. 1 synodic period
pic 1 -- clouds of Venus -- highly concentrated sulphuric acid drops
pic 2 -- surface of Venus venera -- bottom picture how it would look with white light ill.
pic 11 -- how venus would look if clouds removed (from radar reflections)
pic 15 -- elevations on venus from radar (not how it would look to eye)
4) planet
orbits -- 50 AU above sun -- zoom 30 degindicate sun, merc, ven, earth, mars, jup, sat
turn stars on and off
run 1/day till Dec. 1999 -- one complete orbit of Merc.
fastest Merc., slowest Jupiter and Saturn
zoom 120 -- now can see Ur. Nep. Pluto
1month/step rotate till 2010
5) earth
seasons seen from sun -- start today 16 Sept. -- near equinox -- sun near equator -- see earth equator on -- max heating at equatorv13 & 14 review
rotate 1 day at 10min/step day = night = 12 h
1 day/step till Dec. 22
Now can see S. Pole. Rochester is NOT well illuminated
run for 1 day at 10 min/step
1 day/step till March 22 -- equinox again
till Jun2 22 -- now Rochester nicely illuminated -- summer
back to 16 Sept. -- again equinox