Second to Sidereal Day Converter

Time Converter

21 units available

Decimals:

From

To

1.160576e-5

1 s = 1.160576e-5 sid day

Formula:

sid day = s × 0.0000116058

With your value: 1 s = 1.160576e-5 sid day

How big is that?

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

Blink of an eye (1/3.3 your value)0.300 s

Your value1.00 s

Minute (60× your value)60.0 s

Working day (2.9e+4× your value)2.88e+4 s

Day (8.6e+4× your value)8.64e+4 s

Week (6.0e+5× your value)6.05e+5 s

Other Second to Sidereal Day conversions

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

Second to Sidereal Day Conversion Table

Second (s)	Sidereal Day (sid day)
0.5	5.802881e-6
1	1.160576e-5
2	2.321153e-5
5	5.802881e-5
10	0.000116
15	0.000174
20	0.000232
25	0.00029
50	0.00058
100	0.001161
250	0.002901
500	0.005803
1000	0.011606

Sidereal Day to Second Conversion Table

Sidereal Day (sid day)	Second (s)
0.5	43,082.04525
1	86,164.0905
2	172,328.181
5	430,820.4525
10	861,640.905
15	1,292,461.3575
20	1,723,281.81
25	2,154,102.2625
50	4,308,204.525
100	8,616,409.05
250	21,541,022.625
500	43,082,045.25
1000	86,164,090.5

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.

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

Sidereal Day (sid day)

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

How to Convert Second to Sidereal Day

To convert from Second (s) to Sidereal Day (sid day), multiply the value by 1.160576e-5.

Formula: sid day = s × 0.0000116058

Reverse: s = sid day × 86,164.0905

Step-by-Step Example

Start with your value in Second. For example: 5 s
Multiply by the conversion factor: 5 x 1.160576e-5
The result is: 5.802881e-5 sid day

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.

About Sidereal Day

The sidereal day (sid day) is a unit of time. One sidereal day equals 86164.0905 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.

Frequently Asked Questions

How many Sidereal Day are in 1 Second?

There are exactly 1.160576e-5 Sidereal Day in 1 Second. This means the conversion factor from Second to Sidereal Day is 1.160576e-5.

What is the formula to convert Second to Sidereal Day?

The formula to convert Second to Sidereal Day is: sid day = s × 0.0000116058. For example, to convert 10 Second to Sidereal Day, you would multiply 10 by 1.160576e-5.

What is a Second?