| For telescope work one used geocentric co-ordinates, but calculations are done heliocentrically. |
| The downside was that a geocentric orbit placed the spacecraft in a more severe space environment. |
| The timescale used for apparent geocentric ephemerides whose unit of time is the SI second. |
| These and other observations were nails in the geocentric coffin, making Copernicus's heliocentric universe an increasingly persuasive concept. |
| A few taps on the pocket calculator show that the Moon's speed in its geocentric orbit is around 2,300 miles per hour, although variable between perigee and apogee. |
| At this point the geocentric doctrine is being abandoned and the heliocentric takes its place. |
