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10 votes
3 answers
1k views

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

4 votes
2 answers
226 views

How did Scott and Amundsen detect the South Pole?

2 votes
1 answer
55 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
65 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?

0 votes
2 answers
132 views

Did the ancients know about the law of universal gravitation?

14 votes
2 answers
3k views

Why was China slow to recognise the sphericity of Earth?

1 vote
1 answer
64 views

Kepler's Mysterium Cosmographicum with regular polygons: in which nesting order?

26 votes
6 answers
8k views

Is there an astronomical reason behind the order for the names of days of the week?

4 votes
1 answer
2k views

Who determined the temperature of the Sun first?

1 vote
1 answer
89 views

Ancient parallax

2 votes
0 answers
71 views

What happened to the data from the survey that discovered the first pulsars?

2 votes
1 answer
95 views

Did the Ptolemaic system have rotating center of the deferent for Venus?

6 votes
1 answer
1k views

Could ancient astronomers have proven heliocentrism?

7 votes
1 answer
663 views

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

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