× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
g
3
3
2
J
2
p
2
m
2
h
2
s
2
r
2
d
2
l
2
a
2
Home Q & A Board Science-Related Homework Help Physics
New Topic  
julianbato julianbato
wrote...
Posts: 73
Rep: 0 0
11 years ago
to determine what quantity?
a. the relatie distances to the sun and the moon
b. the size of the earth
c. the length of the month
d. the distance to the moon
Read 1647 times
1 Reply

Related Topics

Replies
wrote...
#1
11 years ago
a. the relative distances to the sun and the moon

Take a look here: http://ircamera.as.arizona.edu/NatSci102/NatSci102/text/aristarchus.jpg

The diagram shows the idea: Aristarchus knew that the moon shines by reflected sunlight, so if one measures the angle between the moon and sun when the moon is exactly half illuminated then one can compute the ratio of their distances.
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1148 People Browsing
 139 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 1062
  
 358
  
 289
Your Opinion
Who will win the 2024 president election?
Votes: 3
Closes: November 4
Previous poll results: Do you trust social media networks with protecting your privacy?