⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⣀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⠖⠉⠉⣩⣿⣛⣯⣽⣿⣿⡟⠳⣦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⢠⣴⠶⣶⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⠞⣀⣤⠶⠟⢛⣻⣿⠏⢻⣿⣿⣿⣆⠿⣿⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⢸⡇⢀⣸⣿⠀⠀⠀⠀⠀⠀⠀⠀⡜⣁⠀⣙⠓⠤⠙⠻⠛⠁⣠⣄⢙⣧⣻⣿⠀⣿⣿⣷⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⢸⠱⣿⠏⢸⠀⠀⠀⠀⠀⠀⠀⢸⠁⣼⡿⠟⠛⠲⢴⢶⣶⣿⣿⣿⠿⠗⠉⠉⠀⠻⣿⣿⣷⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⢸⠀⠛⠓⢸⠀⠀⠀⠀⠀⠀⠀⢸⣦⣭⠁⠀⠀⠀⠀⠀⠉⠉⠁⠀⠀⠀⠀⠀⠀⠀⠹⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⢸⠀⠀⣀⢈⡆⠀⠀⠀⠀⠀⠀⢸⣾⣟⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠐⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⢸⠠⣶⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⣿⣿⡿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣷⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⡆⠙⠛⠀⡇⠀⠀⠀⠀⠀⠀⣠⢿⣿⠀⠀⠀⢀⣠⣤⣀⣀⢰⠀⠀⢀⣠⣴⣶⣿⣷⣿⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⣀⣤⡇⠀⠀⠀⣇⢀⡀⠀⠀⠀⠀⣟⣢⠹⠇⠀⠶⣻⣿⣿⠿⡿⠋⡀⠀⣿⠟⠛⠋⠹⠿⢿⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⡼⠁⠀⡇⠀⠀⠀⢹⠉⠉⢳⡀⠀⠀⢻⣿⠛⢇⠀⠀⠈⠀⠠⠚⠁⠀⠳⠀⣿⡀⠀⠀⠀⠀⠀⣿⣿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⣧⠤⠤⡟⠀⠀⠀⣾⡧⠶⢤⣿⣉⣷⡌⢧⡇⢸⢦⡀⠀⠀⠀⠀⢀⡀⠄⠀⢱⠿⣆⠀⠀⠀⠀⣿⡏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⡜⣿⠀⠀⣶⠀⠀⠀⠈⠁⠀⠀⠙⠀⠉⠻⡆⠳⣌⣇⠳⡀⠀⠀⣰⠏⠙⢶⣤⣼⣿⣿⣦⡀⠀⢠⡿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢠⡞⠀⢸⠆⠘⠋⠁⠀⠀⠀⠀⠀⠀⡶⠛⠂⢀⡇⠀⠀⢘⡄⠀⠲⡀⢿⣤⡤⠤⠤⠽⠛⢛⣿⠃⠀⣾⠇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡟⠁⠀⢸⠀⢷⠀⠀⢆⠀⠀⠀⠀⠀⡇⠀⠀⠘⡇⠀⣠⣾⠿⣄⠀⠑⠀⠘⢿⣶⣶⣶⣿⡿⣿⠀⢰⡟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠻⡀⠀⣾⠀⠀⠀⠀⠸⡆⠀⠀⠀⠀⡇⠀⠀⠐⣧⣾⣿⣿⡇⠈⠢⡀⠀⠀⠀⠹⣗⣊⣭⡼⠃⠀⣼⠃⢠⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⢣⠀⠀⠀⠀⠀⠀⠀⠧⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⣿⣿⣄⠀⠈⠢⣄⠀⠀⠀⠁⠀⠀⠀⣰⢿⠀⠀⠉⢦⡀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⢸⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣸⣿⣿⣿⣿⣿⣦⡀⠀⠈⠑⠦⠤⠤⢤⣴⣚⡁⣼⣴⣦⣄⡈⢿⣷⣦⣄⡀⠀⠀⠀⠀
⠀⠀⠑⢦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⣿⣿⣿⣿⣿⣿⣿⡝⢷⠄⠀⠀⠀⢀⣴⠛⠙⣻⣿⣿⣿⡙⠻⠉⢿⣿⣿⣿⣶⣄⠀⠀
⠀⠀⠀⠀⠈⢢⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣿⣿⣿⣿⣿⣿⣿⣿⣿⣌⢷⣄⡀⣠⡾⠻⢿⣯⣤⣤⣉⣻⠇⠀⠀⠈⣿⣿⣿⣿⣿⡆⠀
⠀⠀⠀⠀⠀⠀⠑⢢⣤⣄⠀⠀⠀⠀⠖⠀⣼⠟⢻⣿⣿⣿⣿⣿⣿⣿⣿⣆⠹⠿⠟⠀⠀⠀⠉⠻⣍⣉⣿⠀⠀⠀⠀⠸⣿⣿⣿⣿⣿⡄
⠀⠀⠀⠀⠀⠀⠀⠀⣻⡆⠀⠀⢀⣠⠴⠛⠁⣠⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣧⡀⠀⠀⠀⠀⠀⠀⣸⡵⠟⣳⡄⠀⠀⠀⢿⣿⣿⣿⣿⣷
⠀⠀⠀⠀⠀⠀⣠⣺⡿⠷⠒⠉⠁⠀⣀⣴⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⡀⠀⠀⠀⠀⠀⡏⣰⣿⠟⢙⣆⠀⠀⢸⣿⣿⣿⠿⠋
⠀⠀⠀⠀⢀⡞⠋⠁⣀⣠⣤⣶⣶⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⡀⠀⠀⣀⠀⣿⣿⠁⣰⣿⠿⣆⠀⠸⠿⠋⠁⠀


The Doppler effect is the change in the observed frequency of a wave due to motion of the source of the wave or the observer. If the observer is moving towards a static source, an increase in frequency is observed. Conversely for motion away from the source, fewer wave cycles are encountered per second and a decreased frequency is detected. (McDicken & Anderson, 2011)