Sidereal Day to Fortnight Converter

Time Converter

21 units available

Decimals:

From

To

0.071234

1 sid day = 0.071234 fn

Formula:

fn = sid day × 0.0712335404

With your value: 1 sid day = 0.07123354 fn

How big is that?

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

Minute (1/1.4e+3 your value)0.000696 sid day

Working day (1/3.0 your value)0.334 sid day

Your value1.00 sid day

Day (1.0× your value)1.00 sid day

Week (7.0× your value)7.02 sid day

Year (3.7e+2× your value)366 sid day

Other Sidereal Day to Fortnight conversions

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

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

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

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 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

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

How to Convert Sidereal Day to Fortnight

To convert from Sidereal Day (sid day) to Fortnight (fn), multiply the value by 0.0712335404.

Formula: fn = sid day × 0.0712335404

Reverse: sid day = fn × 14.0383307359

Step-by-Step Example

Start with your value in Sidereal Day. For example: 5 sid day
Multiply by the conversion factor: 5 x 0.0712335404
The result is: 0.356168 fn

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.

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.

Frequently Asked Questions

How many Fortnight are in 1 Sidereal Day?

There are exactly 0.0712335404 Fortnight in 1 Sidereal Day. This means the conversion factor from Sidereal Day to Fortnight is 0.0712335404.

What is the formula to convert Sidereal Day to Fortnight?

The formula to convert Sidereal Day to Fortnight is: fn = sid day × 0.0712335404. For example, to convert 10 Sidereal Day to Fortnight, you would multiply 10 by 0.0712335404.

What is a Sidereal Day?