Utilities

Astronomical Tools

Quick converters and utilities for observational astronomy

RA & Dec Converter

Convert Right Ascension and Declination from decimal degrees to sexagesimal coordinates (hh:mm:ss, dd:mm:ss).

RA & Dec Converter

Convert Right Ascension and Declination from sexagesimal coordinates to decimal degrees.

Julian Date Converter

Convert between calendar dates, Julian Dates (JD), and Modified Julian Dates (MJD).

Wavelength ↔ Frequency

Convert between wavelength (Å), frequency (Hz), and energy (keV) for electromagnetic radiation.

Flux Density Converter

Convert between F_λ (erg cm⁻² s⁻¹ Å⁻¹) and F_ν (erg cm⁻² s⁻¹ Hz⁻¹) flux densities.

Live clocks for Salt Lake City, Warsaw, Paris, India, and New York — plus a customizable timezone.

Observing Planner

Live LST and hour angle, Sun/Moon rise and set, and target visibility charts.

A tool for sketching AGN, jets, outflows and spectra with ready-made shapes. Export SVG, PNG or PDF.

⚠️ Disclaimer: These tools were created for personal use. You are welcome to use them, but I cannot take responsibility for any discrepancies that may arise. I would be glad to address any issues — feel free to email ashwanitapan@gmail.com.