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La Silla petroglyphs finder
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Calculators
Here follow some useful calculators, not only astronomy-related.
Cosmology
Ned Wright's Cosmology Calculator
Ned Wright's Advanced Cosmology Calculator
Passive Evolution Calculator
Cosmic Variance Calculator
Initiative for cosmology
Observing
ESO Exposure Time Calculator
Spitzer Performance Estimation Tool
Selected magnitude systems, zeropoints, extinction, wavelengths
B1950 to J2000 coordinates converter
Equatorial to Galactic coordinates converter
Conversion of Units
Conversion of Units (Univ. Berlin)
The versatile units converter
How Many? A Dictionary of Units of Measurement
Power conversion
Statistics
Free Statistics Calculators, by Daniel S. Soper
Binomial Coefficient Calculator
Others
NASA Solar Eclipses calculator
Currency Calculator