doppler-shift-visualiser
Doppler Shift Visualiser
A simple Python and web-based tool for visualising Doppler shift in astronomical spectra.
What this project does
This project shows how spectral lines move when an astronomical object has radial motion relative to the observer.
- Positive velocity means the object is moving away: redshift
- Negative velocity means the object is moving towards us: blueshift
Physics background
For small velocities compared with the speed of light, the Doppler shift can be approximated as:
Δλ / λ = v / c
where:
- Δλ is the change in wavelength
- λ is the original wavelength
- v is radial velocity
- c is the speed of light
Why this matters
Doppler shift is central to observational astronomy. It is used to study:
- radial velocity of stars
- exoplanet detection
- binary stars
- galaxy motion
- spectroscopy
Live Demo
Licence and attribution
Code in this repository is released under the MIT Licence.
Images, diagrams, written explanations, and educational content are © 2026 Biswajit Jana unless otherwise stated.
Please credit this repository if you reuse or adapt any visual or explanatory material.
Suggested attribution:
“Doppler Shift Visualiser by Biswajit Jana — https://github.com/Biswajit1999/doppler-shift-visualiser”
Python version
Run:
```bash pip install -r requirements.txt python main.py
Research Quality Upgrade
See RESEARCH_QUALITY.md for the validation layer, reference anchors, equations and research boundaries added to this repository.