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People: Edward Plantagenet

Kepler, slowly continuing his analysis of Tycho's …

Years: 1603 - 1603

Kepler, slowly continuing his analysis of Tycho's Mars observations—now available to him in their entirety—begins the slow process of tabulating the Rudolphine Tables, while also picking up the investigation of the laws of optics from his lunar essay of 1600.

Both lunar and solar eclipses present unexplained phenomena, such as unexpected shadow sizes, the red color of a total lunar eclipse, and the reportedly unusual light surrounding a total solar eclipse.

Related issues of atmospheric refraction apply to all astronomical observations.