Full name: gigasecond
Plural form: gigaseconds
Symbol: Gs
Alternate spelling: gigasec
Category type: time
Scale factor: 1000000000
The SI base unit for time is the second.
1 second is equal to 1.0E-9 gigasecond.
Valid units must be of the time type.
You can use this form to select from known units:
The SI prefix "giga" represents a factor of 109, or in exponential notation, 1E9.
So 1 gigasecond = 109 arcseconds.
The definition of a second is as follows:
A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 (approximately 7.7×10-7) of a circle. It is the angular diameter of an object of 1 unit diameter at a distance of 360×60×60/(2pi) (approximately 206,265 units), such as (approximately) 1 cm at 2.1 km, or, directly from the definition, 1 astronomical unit at 1 parsec.