semicircle to arcsecond
Convert semicircle (semicircle) to arcsecond (″). Use an editable angle converter, conversion formula, and reference table.
1 semicircle = 648,000 ″
Conversion formula
One semicircle equals 648,000 arcsecond. Multiply your value in semicircle by this factor to get arcsecond. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 semicircle:5 × 648,000 = 3,240,000 ″
Conversion table
| semicircle (semicircle) | arcsecond (″) |
|---|---|
| 0.01 | 6,480 |
| 0.1 | 64,800 |
| 1 | 648,000 |
| 2 | 1,296,000 |
| 5 | 3,240,000 |
| 10 | 6,480,000 |
| 25 | 16,200,000 |
| 50 | 32,400,000 |
| 100 | 64,800,000 |
| 1000 | 648,000,000 |
About these measurements
An angle describes rotation between directions.
The base reference used here is the radian. One semicircle is 3.141592654 base units; one arcsecond is 0.000004848136811 base units.
Important distinctions
A full turn is 360 degrees or 2π radians. Signed angles are permitted.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert semicircle to ″?
Multiply the quantity in semicircle by 648,000. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the arcsecond to semicircle converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
