He reduced six Lagrangean-Laplacian elliptical elements to two vectors determining mechanics of planetary movements.

Make the most of all opportunities because this planetary movement only occurs once every 12 years.

He believes that most aspects of this world, including financial markets, are consequences of planetary movements.

While following the planetary movements, his eyes could clearly make out the continents-Africa, America, with the Atlantic Ocean between them.

The Derby Orrery does not show mean distance, but demonstrated the relative planetary movements.

The question of "when a human life begins" cannot be answered by reference to scientific principles like those with which we predict planetary movement.

He kept that computation going, for the longer the planetary movement was observed, the more accurate the computation of its orbital elements.

The new science standards would require students to describe and explain ocean tides, constellations, planetary movements and other natural phenomenon.

Kepler, I hold your observations of planetary movements in high esteem, I consider them as outstanding.

However he found that 27 spheres was insufficient to account for the planetary movements, and so he added seven more for a total of 34.