Fortnight to Sidereal Day Converter

Time Converter

21 units available

Decimals:

From

To

14.038331

1 fn = 14.038331 sid day

Formula:

sid day = fn × 14.0383307359

With your value: 1 fn = 14.03833074 sid day

How big is that?

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

Minute (1/2.0e+4 your value)0.0000496 fn

Working day (1/42 your value)0.0238 fn

Day (1/14 your value)0.0714 fn

Week (1/2.0 your value)0.500 fn

Your value1.00 fn

Year (26× your value)26.1 fn

Other Fortnight to Sidereal Day conversions

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

Fortnight to Sidereal Day Conversion Table

Fortnight (fn)	Sidereal Day (sid day)
0.5	7.019165
1	14.038331
2	28.076661
5	70.191654
10	140.383307
15	210.574961
20	280.766615
25	350.958268
50	701.916537
100	1,403.833074
250	3,509.582684
500	7,019.165368
1000	14,038.330736

Sidereal Day to Fortnight Conversion Table

Sidereal Day (sid day)	Fortnight (fn)
0.5	0.035617
1	0.071234
2	0.142467
5	0.356168
10	0.712335
15	1.068503
20	1.424671
25	1.780839
50	3.561677
100	7.123354
250	17.808385
500	35.61677
1000	71.23354

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.

Fortnight (fn)

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

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 Fortnight to Sidereal Day

To convert from Fortnight (fn) to Sidereal Day (sid day), multiply the value by 14.0383307359.

Formula: sid day = fn × 14.0383307359

Reverse: fn = sid day × 0.0712335404

Step-by-Step Example

Start with your value in Fortnight. For example: 5 fn
Multiply by the conversion factor: 5 x 14.0383307359
The result is: 70.191654 sid day

About Fortnight

The fortnight (fn) is a unit of time. One fortnight equals 1.209600 × 10^+6 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 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 Fortnight?

There are exactly 14.0383307359 Sidereal Day in 1 Fortnight. This means the conversion factor from Fortnight to Sidereal Day is 14.0383307359.

What is the formula to convert Fortnight to Sidereal Day?

The formula to convert Fortnight to Sidereal Day is: sid day = fn × 14.0383307359. For example, to convert 10 Fortnight to Sidereal Day, you would multiply 10 by 14.0383307359.

What is a Fortnight?