🔠Astronomy Tools Suite
Julian Date Calculator
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Converts a calendar date/time to Julian Date, which is used in astronomical timekeeping. JD = days since noon, January 1, 4713 BCE.
Calculate JD
RA/Dec Converter
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Convert RA from HH:MM:SS to degrees and Dec from DD:MM:SS to degrees. This format is standard in celestial coordinate systems.
Convert
Cosmology: Distance vs Redshift
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Estimate comoving distance from redshift using a basic ΛCDM cosmology (H₀ = 70, Ωₘ = 0.3). Useful for large-scale structure studies.
Calculate
Galactic Extinction Calculator
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Computes extinction A(λ) using E(B-V) and band-specific R-values from Schlafly & Finkbeiner (2011). Useful for correcting observed magnitudes.
V-band
g-band
r-band
i-band
Calculate
Angular Size Calculator
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Convert physical size (in kpc) to angular size using angular diameter distance. θ = (D / D
A
) × 206.265 arcsec.
Calculate
Lookback Time Calculator
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Estimate the time since light left a galaxy, given redshift. Approximate formula: t = z / (1+z) × 13.8 Gyr.
Calculate
Airmass Calculator (Simplified)
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Estimate airmass using: airmass ≈ sec(z) = 1 / cos(90° – Altitude). Used to determine atmospheric attenuation.
Calculate