TABLE OF CONTENTS The following idiosyncratic collection of tables and values represents frequently needed approximate information and conversion factors for the EO practitioner. This eclectic collection consist of constants, conversions, and definitions categorized by the authors' whims. Although sometimes included, the authors are not encouraging the use of deprecated and archaic units. Such units are included here only as a help with their translation to more widely accepted SI units.
| Arcseconds | 4.848 microradians |
|---|---|
| 2.77 10 ?4 degrees | |
| Degree | 0.01745 radians |
| 17.5 milliradians | |
| 60 arcminutes | |
| 3600 arcseconds | |
| 17,452 microradians | |
| Arcminute | 0.0167 degrees |
| 2.909 10 ?4 radians | |
| Radian | 0.159 of the circumference |
| 57.296 degrees | |
| 3438 arcminutes | |
| 2.06 10 5 seconds | |
| Steradian | 0.08 of total solid angle |
| Rads/sec | 0.159 revolutions per second |
| 9.55 revolutions per minute | |
| 57.3 degrees per second | |
| RPM | 6 degrees per second |
| 0.0167 revolutions per second | |
| 0.105 radians per second | |
| RPS | 21,600 degrees per minute |
| Square centimeter | 1.076 10 ?3 square foot |
| 0.155 square inch | |
| 1 10 ?4 square meter | |
| Square mil | 645 square micrometers |
| Square inch | 6.452 square centimeters |
| Square foot | 939 square centimeters |
| 0.092 square meters |
| Astronomical unit | 1.496 10 8 kilometers |
| (mean Earth-Sun distance) | 93 million miles |
| Light year | 9.46 10 15 meters |
| 9.46 10 12 kilometers | |
| 5.88 10 12 |
