Convert Spat to Hemisphere
Convert spats to hemispheres by entering a value below.
How to Convert Spats to Hemispheres
The spat and hemisphere are both units of solid angle. By definition, 1 spat equals exactly 2 hemispheres. This means to convert spats to hemispheres, you multiply by 2.
Formula
Step-by-Step Example
Convert 5 sp to hemispheres:
We need to convert spats to hemispheres
Since 1 sp = 2 hemisphere, multiply by 2
5 × 2 = 10
5 sp = 10 hemisphere
Spat to Hemisphere Conversion Table
Quick reference table for common spat to hemisphere conversions. Click any value for detailed calculation.
| Spats (sp) | Hemispheres (hemisphere) |
|---|---|
| 1 sp | 2 hemisphere |
| 2 sp | 4 hemisphere |
| 5 sp | 10 hemisphere |
| 10 sp | 20 hemisphere |
| 15 sp | 30 hemisphere |
| 20 sp | 40 hemisphere |
| 25 sp | 50 hemisphere |
| 50 sp | 100 hemisphere |
| 100 sp | 200 hemisphere |
About These Units
Spat (sp)
The spat equals 4π steradians (≈12.566 sr)—the solid angle subtended by a complete sphere as seen from its center. One spat = 41,253 square degrees = 1 full sphere. Used in radiation physics and isotropic source calculations. Rarely used; steradians preferred.
Hemisphere (hemisphere)
A hemisphere equals 2π steradians (≈6.283 sr)—half of a complete sphere. Represents the visible sky from any point on Earth, or one side of a surface. Used in lighting calculations: a horizontal surface receives radiation from a hemisphere of solid angle.
Frequently Asked Questions
How do I convert spats to hemispheres?
To convert spats to hemispheres, multiply the value by 2. For example, 10 sp = 20 hemisphere.
How many hemispheres are in 1 spat?
1 spat equals 2 hemispheres.
What is the formula for spats to hemispheres?
The formula is: hemisphere = sp × 2.