TLE

Implementing the "Two-line element set (TLE)", a data format encoding orbital elements of Earth-orbiting objects.

Format

(the below tables are copied 1:1 from wikipedia (from here))

Field	Columns	Content	Example
1	01-24	Satellite name	ISS (ZARYA)

Field	Columns	Content	Example
1	01-01	Line number	`1`
2	03–07	Satellite number	`25544`
3	08–08	Classification (U=Unclassified)	`U`
4	10–11	International Designator (Last two digits of launch year)	`98`
5	12–14	International Designator (Launch number of the year)	`067`
6	15–17	International Designator (piece of the launch)	`A`
7	19–20	Epoch Year (last two digits of year)	`08`
8	21–32	Epoch (day of the year and fractional portion of the day)	`264.51782528`
9	34–43	First Time Derivative of the Mean Motion divided by two [11]	`−.00002182`
10	45–52	Second Time Derivative of Mean Motion divided by six (decimal point assumed)	`00000-0`
11	54–61	BSTAR drag term (decimal point assumed) [11]	`-11606-4`
12	63–63	The number 0 (originally this should have been "Ephemeris type")	`0`
13	65–68	Element set number. Incremented when a new TLE is generated for this object.[11]	`292`
14	69–69	Checksum (modulo 10)	`7`

Field	Columns	Content	Example
1	01–01	Line number	`2`
2	03–07	Satellite number	`25544`
3	09–16	Inclination (degrees)	`51.6416`
4	18–25	Right ascension of the ascending node (degrees)	`247.4627`
5	27–33	Eccentricity (decimal point assumed)	`0006703`
6	35–42	Argument of perigee (degrees)	`130.5360`
7	44–51	Mean Anomaly (degrees)	`325.0288`
8	53–63	Mean Motion (revolutions per day)	`15.72125391`
9	64–68	Revolution number at epoch (revolutions)	`56353`
10	69–69	Checksum (modulo 10)	`7`

Run the tests:

$ go test -v .
...

See the test coverage:

$ go test -coverprofile=coverage.out && go tool cover -html=coverage.out
...

Feel free to make one (or more) pull requests!