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Furlongs per fortnight

Main article: Furlongs per fortnight

It's about the chains. Credit: Stilfehler.{{free media}}

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 $R_{\oplus }$ indicate the Earth's radius.

Notation: let the symbol $R_{J}$ indicate the radius of Jupiter.

Notation: let the symbol $R_{\odot }$ indicate the solar radius.

Both physics and astronomy use units and dimensions to describe observations.

Units of Physics and Astronomy

Dimension	Astronomy	Symbol	Physics	Symbol	Conversion
time	1 day	d	1 second	s	1 d = 86,400 s
time	1 "Julian year"	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
angular distance	1 parsec	pc	1 meter	m	1 pc ~ 30.857 x 1012 km