Tagged Questions
7
votes
3answers
74 views
Parallax, obliquity, precession, and Orion?
Today, the obliquity of the earth is about 23.4°.
6500 years ago, it was about 24.1°
Imagine the blue square is the constellation of Orion, and the yellow star is the sun. Viewpoint B is you, on ...
0
votes
1answer
69 views
Other than the motion of the Earth, what else would cause parallax?
Wikipedia has this to say about the discovery of the aberration of light:
In 1728, while unsuccessfully attempting to measure the parallax of Eltanin, James Bradley discovered the aberration of ...
3
votes
1answer
232 views
When and how were relative distances to the planets first measured?
I understand that the absolute distance to a planet can be measured using earth-baseline (e.g., diurnal) parallax, and that the first reasonably accurate such measurement was made for Mars by Cassini ...
0
votes
0answers
115 views
To measure the distance to a star using spectroscopic parallax which two do you need to know? [closed]
To measure the distance to a star using spectroscopic parallax which two do you need to know?
A) Spectral type
B) Parallax angle
C) Visual or apparent magnitude
D) Mass
