Adjust ellipse rounding
The current rounding does not provide quite enough precision for the semi-major and semi-minor axis. Change the rounding settings to the following:
- ra: sexagesimal hours, minutes, and seconds
- dec: sexagesimal degrees, minutes, seconds
- a, b, pa: decimal degrees to the nearest hundredth of a degree, which is slightly less than arcminute precision
CC @keita.kawabe, who asked about the rounding on Mattermost.