Sidereal Year to Second Converter

Time Converter

21 units available

Decimals:

From

To

31,558,149.504

1 sid yr = 31,558,149.504 s

Formula:

s = sid yr × 31,558,149.504

With your value: 1 sid yr = 31,558,149.504 s

How big is that?

Everyday references on a logarithmic scale, all expressed in sidereal year so you can sanity-check the result.

Minute (1/5.3e+5 your value)0.00000190 sid yr

Working day (1/1.1e+3 your value)0.000913 sid yr

Day (1/3.7e+2 your value)0.00274 sid yr

Week (1/52 your value)0.0192 sid yr

Year (1/1.0 your value)1.00 sid yr

Your value1.00 sid yr

Other Sidereal Year to Second conversions

2 sid yr to s 3 sid yr to s 4 sid yr to s 5 sid yr to s 6 sid yr to s 7 sid yr to s 8 sid yr to s

Sidereal Year to Second Conversion Table

Sidereal Year (sid yr)	Second (s)
0.5	15,779,074.752
1	31,558,149.504
2	63,116,299.008
5	157,790,747.52
10	315,581,495.04
15	473,372,242.56
20	631,162,990.08
25	788,953,737.6
50	1,577,907,475.2
100	3,155,814,950.4
250	7,889,537,376
500	15,779,074,752
1000	31,558,149,504

Second to Sidereal Year Conversion Table

Second (s)	Sidereal Year (sid yr)
0.5	1.584377e-8
1	3.168754e-8
2	6.337507e-8
5	1.584377e-7
10	3.168754e-7
15	4.753130e-7
20	6.337507e-7
25	7.921884e-7
50	1.584377e-6
100	3.168754e-6
250	7.921884e-6
500	1.584377e-5
1000	3.168754e-5

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Sidereal Year (sid yr)

Time

SI definition

Traceable to the second, defined by fixing the caesium-133 hyperfine transition frequency at 9 192 631 770 Hz.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Second (s)

Time

SI definition

The second is defined by taking the caesium-133 ground-state hyperfine transition frequency to be exactly 9 192 631 770 Hz.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Sidereal Year to Second

To convert from Sidereal Year (sid yr) to Second (s), multiply the value by 31,558,149.504.

Formula: s = sid yr × 31,558,149.504

Reverse: sid yr = s × 3.168754e-8

Step-by-Step Example

Start with your value in Sidereal Year. For example: 5 sid yr
Multiply by the conversion factor: 5 x 31,558,149.504
The result is: 157,790,747.52 s

About Sidereal Year

The sidereal year (sid yr) is a unit of time. One sidereal year equals 3.155815 × 10^+7 seconds. UnitConvertLab converts it against every other time unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: time calculations, engineering and science, education.

About Second

The second (s) is a unit of time. One second equals 1 second. UnitConvertLab converts it against every other time unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: time calculations, engineering and science, education.

Frequently Asked Questions

How many Second are in 1 Sidereal Year?

There are exactly 31,558,149.504 Second in 1 Sidereal Year. This means the conversion factor from Sidereal Year to Second is 31,558,149.504.

What is the formula to convert Sidereal Year to Second?

The formula to convert Sidereal Year to Second is: s = sid yr × 31,558,149.504. For example, to convert 10 Sidereal Year to Second, you would multiply 10 by 31,558,149.504.

What is a Sidereal Year?