Questions tagged [period]
The period tag has no usage guidance.
7
questions
5
votes
2
answers
772
views
How did the year 1904 not have 367 days?
We know that the Earth completes a revolution around the Sun about every 365.25 days. But we consider each year 365 days and add one day to the year every four years in order to have the leap year and ...
- 1,137
4
votes
0
answers
89
views
I was finding the period of crab pulsar using efsearch(xronos)
I was finding the period of crab pulsar(one orbit data from ASTROSAT/laxpc) using efsearch (heasarc/xronos). Despite considering period = 33ms, I am not getting sharp peaks at higher Resolution for ...
3
votes
1
answer
204
views
Period-Luminosity Relation of Cepheids via Gaia Data
I was trying to verify Leavitt's Law of Period Luminosity Relationships of Cepheid Variables using Gaia data. To do this I calculated the period using the Lomb Scargle Periodogram for 1450 stars and ...
- 779
2
votes
0
answers
104
views
What are the orbital periods Jupiter, Saturn and earth?
What are the highest accuracy (and hence precision) orbital periods of Jupiter, Saturn and earth in units of days.
Note have Allen’s Astronomical Quant(Cox1991)/ Wolfram-α / Wikipedia / 3ea. don’t ...
- 21
1
vote
1
answer
127
views
Doesn't Gregorian Calendar being started each year on 00:00 cause a huge error in the future?
While Gregorian calendar is a solar year it always start on 00:00 each year. But for sure the Earth completes each orbit around the Sun on different times each year.
So if we put January 1 as the ...
- 1,137
1
vote
1
answer
146
views
How is a comet visible when far from the Sun
The latest news tells of a super large "mega" comet C/2014 UN271 (Bernardinelli–Bernstein)
approaching the Solar System in about 9 years.
It must be very far from the Sun, so how do we ...
- 670
1
vote
0
answers
50
views
Period estimate [closed]
How would you estimate the period or range of periods for two stars, please? I know the right ascension, declination, and distance.
I could estimate the masses and assume that the stars are in ...
- 781