Questions tagged [period]

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4 votes
2 answers
369 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 ...
Snack Exchange's user avatar
4 votes
0 answers
70 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 ...
Pratived sahu's user avatar
3 votes
1 answer
96 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 ...
Ambica Govind's user avatar
2 votes
0 answers
84 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 ...
Joe Horwath's user avatar
1 vote
1 answer
110 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 ...
Snack Exchange's user avatar
1 vote
1 answer
127 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 ...
John Canon's user avatar
1 vote
0 answers
46 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 ...
Elena Greg's user avatar