21 Seconds to Degrees

21" ≈ 0.0058333°

Calculation: ° = 21" × 0.000277778 ≈ 0.0058333°

Second to Degree Converter

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Sig. Figures:

How wide is 21"?

21 second (0.006 degrees) is comparable to the precision of a telescope crosshair, an almost imperceptible angle.

What does 21" look like?

Illustration of a telescope crosshair reticle
21 second (0.006 degrees) is comparable to the precision of a telescope crosshair, an almost imperceptible angle.

How to Convert Second to Degree

1 second = 0.000277778 degrees

Degree = Second × 0.000277778

Example: 21" × 0.000277778 = 0.0058333°

Reverse Conversion

To convert degrees back to seconds:

  • Remember, 1 degree equals 3600 seconds.
  • To convert 0.0058333° to", multiply 0.0058333 x 3600, resulting in 21".

21 " is also equal to:

  • 0.00010181 radian
  • 0.0064815 gradian
About these units

Second: An arcsecond (second of arc) is 1/60 of an arcminute.It is common in astronomy, surveying, astrometry, and precision optics for high-precision angles.

Degree: The degree (°) is a non-SI unit of plane angle defined as 1/360 of a full rotation.It is accepted for use with the SI due to its long-standing practical importance in navigation, surveying, engineeri...

Frequently Asked Questions

How much is 21 seconds in degrees?

21 seconds equals 0.0058333 degrees. This is calculated by multiplying 21 by the conversion factor 0.000277778.

What does 21 seconds look like in degrees?

21 seconds (0.0058333 degrees) is a fraction of an arc minute; 3600 arc seconds make one degree.

How do you calculate 21 seconds to degrees?

Multiply 21 by the conversion factor 0.000277778. The calculation is 21 × 0.000277778 = 0.0058333 degrees. This factor is defined by international measurement standards.

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21 seconds = 0.00583333 degrees
21 seconds = 0.00583333 degrees — conversion chart

Nearby Conversions

11 seconds0.003056 degrees 12 seconds0.003333 degrees 13 seconds0.003611 degrees 14 seconds0.003889 degrees 15 seconds0.004167 degrees 16 seconds0.004444 degrees 17 seconds0.004722 degrees 18 seconds0.005 degrees 19 seconds0.005278 degrees 20 seconds0.005556 degrees 22 seconds0.006111 degrees 23 seconds0.006389 degrees 24 seconds0.006667 degrees 25 seconds0.006944 degrees 26 seconds0.007222 degrees 27 seconds0.0075 degrees 28 seconds0.007778 degrees 29 seconds0.008056 degrees 30 seconds0.008333 degrees 31 seconds0.008611 degrees

For general conversions between seconds and degrees, see the seconds to degrees converter.

Also convert Seconds to:

Conversion factors verified against BIPM, ISO 80000-3 1 turn = 2π rad = 360° (exact, ISO 80000-3). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.