Phases of the Moon and Eclipses: 2001 to 2020



Solar System: Orbital and physical characteristics of the Sun and the planets





Astronomical constants (IAU 1976)



Earth's Seasons:  Equinoxes, Solstices, Perihelion, and Aphelion from 1992 to 2020




Free educational resources for Astronomy and Geophysics.
VaxaSoftware makes no representation about the accuracy, correctness, or suitability of this material for any purpose.


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Free educational resources for Astronomy and Geophysics

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Acid-base equilibria for Windows ®
pH, concentrations, equilibrium constants...






Multi-stage distillation simulator







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Acid-base titration calculator for Windows

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