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Lecture 6

AST 101 Lecture Notes - Lecture 6: Hebrew Calendar, Babylonian Calendar, Chinese Calendar


Department
Astronomy
Course Code
AST 101
Professor
Walter Freeman
Lecture
6

Page:
of 2
Next%Mastering%Astronomy%HW%posted%tonight%and%due%next%Wednesday
OFFICE/CLINIC%HOURS%WILL%be%held%this%Friday%as%per%usual
Coaches/Professor%will%be%holding%extended%office/clinic%hours%next%Week%
to%help%study%for%the%exam%NEXT%WEDNESDAY
Announcements:
We%now%understand%the%motion%of%the%stars,%and%the%combined%effects%of%
the%Earth's%axial%tilt,%rotation,%and%orbit%have%on%the%seasons
Taking%Stock
The%moon%has%often%been%a%symbol%of%change
That%change%is%regular,%though:%every%29.5%days,%the%pattern%of%the%phases%
repeats
The%Hebrew%Calendar
The%Traditional%Chinese%Calendar
Babylonian%Calendar
(But%not%the%traditional%calendars%of%Europe!)
This%is%orderly%enough%that%it%is%the%basis%of%many%calendars:
The%Phases%of%the%Moon
The%Moon%differs%from%other%stars%because%it%doesnt%make%its%own%light
It%orbits%the%Earth%400,000%km%away%(1/500%AU)%once%about%every%29%days,%
orbiting%counterclockwise%when%looking%down%at%the%North%Pole%of%the%
Moon
The%phases%of%the%Moon%happen%because%half%of%the%moon%is%always%lit%by%
the%sun,%but%our%perspective%changes%how%much%of%that%half%we%see
Everything%else%in%the%sky%seems%to%be%a%constant%size%and%shape,%but%the%moon%
waxes%(gets%bigger)%and%wanes%(gets%smaller).%Why?
New%Moon:%Nothing%is%Visible
Crescent:%less%than%half%visible
Half%Moon:%half%of%the%moon's%surface%is%visible
Gibbous:%more%than%half%visible
Full%Moon:%All%visible
New%Words%for%the%Moon%Phases:
Dont%be%afraid%to%draw%little% pictures%to%help%you%figure%out%what%time/what%
phase%a%person%is%looking%at!
Phases&of&the&Moon
Thursday,% September% 15,%2016
2:04%PM
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phase%a%person%is%looking%at!
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