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1 vote
0 answers
155 views

Where did William Herschel plan to put his head? Peer over the edge of the famous 40-foot telescope or try to get less off-axis; closer to the center?

1 vote
0 answers
78 views

Who "made" Gauss?

20 votes
1 answer
4k views

How did Babylonians figure out that the evening star is the morning star?

2 votes
0 answers
61 views

Reference to a comment by Arthur C. Clarke

2 votes
0 answers
38 views

History of Observational "Nowruz" (Iranian New Year)

7 votes
1 answer
700 views

Entry 97 in Gauss's diary and the status of "lunar parallax" in the late 18th century

11 votes
3 answers
1k views

How did Eratosthenes determine that Alexandria and Syene were on the same meridian?

1 vote
4 answers
219 views

Why does Eratosthenes method for calculating the circumference of the Earth requires the city of Alexandria and Syene to be in the same meridian?

3 votes
0 answers
90 views

Width of zodiac

9 votes
1 answer
2k views

When did we learn that our galaxy was merely one amongst many billions?

5 votes
1 answer
1k views

Did Caroline Herschel know about the discovery of Neptune?

4 votes
2 answers
365 views

How did Scott and Amundsen detect the South Pole?

2 votes
1 answer
65 views

What laser technology/ies were first used to bounce off of the Apollo 11 retroreflectors to accurately measure distance to the Moon?

2 votes
1 answer
97 views

How did the earliest measurements of lasers bounced off of Apollo 11 retroreflectors deal with the light from the Moon and pick out single photons?

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