Questions tagged [telescope]

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17
votes
1answer
211 views

Did the Digges Telescope actually exist?

There are many claimants for the first telescope. Amongst these are the claims placed at the doors of Bacon and Digges. The Bacon claim is very sketchy, boiling down to one sentence and is easy to ...
6
votes
1answer
78 views

What advances allowed Lippershey and Galileo to make working telescopes?

If a working telescope was barely possible at the time of Digges (circa 1570s), what technical advances allowed Lippershey (patent 1608) and especially Galileo (1609 onwards) to create working ...
5
votes
1answer
403 views

When William Herschel discovered Uranus, who else at the time had a comparable telescope?

William Herschel built a big telescope and observed Uranus in 1781. I'm trying to figure out who else had a comparable telescope at the time, who could verify these observations? Apparently Johan ...
4
votes
1answer
397 views

When was the first true Gregorian telescope built?

I know that James Gregory came up with the idea of using a parabolic mirror to eliminate spherical aberration in 1663. The theory behind it had actually been around since classical antiquity I think....
2
votes
2answers
98 views

Where are the mirrors of the historic telescopes today?

Are the great mirrors and lenses of historic telescopes preserved? Those of Herschel and Rosse and many others and back to the 18th and 17th centuries. The wooden structures of those telescopes I can ...
2
votes
1answer
87 views

Could someone have discovered the moons of Jupiter before Galileo?

As Hans Lipperperhey had made a decent telescope albeit worse telescope before Galileo, source, would he have been able to theoretically view the moons of Jupiter before Galileo if he had looked?
2
votes
1answer
45 views

Are there any records of the history for the development of speculum alloy?

I am curious if anyone has seen any records on how this alloy was first developed or perhaps accidentally discovered? One could ask a similar question for any alloy but since this is peculiar in ...
1
vote
1answer
89 views

Did Galileo really see Galilean Moons?

I want the answer to incorporate apparent magnitudes of those moons, power of his telescope, light pollution of that time, successful recreation of the scenario of watching Galilean moons using that ...