What is 30at in Sidereal Seconds?

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What is 30 Tropical Years (30at) in Sidereal Seconds (s-sr)?

What is 30at in s-sr? Convert 30 Tropical Years (30at) to Sidereal Seconds (s-sr) and show formula, brief history on the units and quick maths for the conversion.

Enter Tropical Years to convert to Sidereal Seconds


Quick Reference for Converting Tropical Years to Sidereal Seconds

Formula
s-sr = at x 31643330.21
Quick Rough Maths
To get the Sidereal Seconds, multiply the number of Tropical Years by 31.6 million
Tropical Years (at) in 1 Sidereal Second
There are 0 Tropical Years in 1 Sidereal Second
Sidereal Seconds (s-sr) in 1 Tropical Year
There are 31643330.21 Sidereal Seconds in 1 Tropical Year

Unit Information

Tropical Year
/ˈtrɒpɪk(ə)l jɪə,jəː/
Symbol: at
Unit System: SI

What is the Tropical Year?

The tropical year is a unit of time that is a multiple of an SI unit. We have used the symbol at.

The average tropical year up to the year 2000 was 365.2422 days of 86400 seconds.

The phrase “tropical” comes from the Greek for “turn”; tropikos. Following this, and where the “turn” referred to is the same as that defining the tropics of Capricorn and Cancer (the extreme latitudes North and South where the sun can still appear directly overhead or perpendicular to the Earth’s surface); a tropical year is known as the time it takes the sun to complete a full cycle of seasons and return to the same relative position to the observer on Earth.

In 1627, Johannes Kepler used the findings of Tycho Brahe and Waltherus (the Rudolphine Tables) to establish the mean tropical year as 365 solar days, 5 hours, 48 minutes and 45 seconds.

Sidereal Second
/sʌɪˈdɪərɪəlˈsɛk(ə)nd/
Symbol: s-sr
Unit System: SI

What is the Sidereal Second?

The sidereal second is a unit of time used by astronomers and is derived from the SI unit system. We have used the symbol s-sr.

1 sidereal second is 1/60 of a sidereal minute. This is derived ultimately from the sidereal day which is the time taken (in solar seconds) for the Earth to complete one rotation with respect to a distant star or constellation.

Like with normal seconds, minutes, hours and days, there are still 60 x 60 x 24 seconds in a day, but the day itself is approximately 23 h 56 min and 4.1 s in (normal) seconds.


Conversion Tables for Tropical Years (at) to Sidereal Seconds (s-sr)