Portal:Radiation astronomy/Problems/5
Jump to navigation
Jump to search
Furlongs per fortnight
Furlongs per fortnight is a problem set with a contained quiz that focuses on the fundamentals of observational and deductive astronomy. In the activity Energy phantoms you learned about the value of distance, or displacement, and motion, speed, velocity, and acceleration. Here, you can practice and test yourself on converting from units that may or have occurred in the literature to units popular today.
Notation: let the symbol indicate the Earth's radius.
Notation: let the symbol indicate the radius of Jupiter.
Notation: let the symbol indicate the solar radius.
Both physics and astronomy use units and dimensions to describe observations.
| Dimension | Astronomy | Symbol | Physics | Symbol | Conversion |
|---|---|---|---|---|---|
| time | 1 day | d | 1 second | s | 1 d = 86,400 s[1] |
| time | 1 "Julian year"[2] | J | 1 second | s | 1 J = 31,557,600 s |
| distance | 1 astronomical unit | AU | 1 meter | m | 1 AU = 149,597,870.691 km[1] |
| angular distance | 1 parsec | pc | 1 meter | m | 1 pc ~ 30.857 x 1012 km[1] |
References
- ↑ 1.0 1.1 1.2 Template:Cite book
- ↑ International Astronomical Union "SI units" accessed February 18, 2010. (See Table 5 and section 5.15.) Reprinted from George A. Wilkins & IAU Commission 5, "The IAU Style Manual (1989)" (PDF file) in IAU Transactions Vol. XXB