Ravi Dasami Parv is observed when there is Dasami Tithi falls on Sunday. The day is dedicated to Surya or sun god. It is considered highly meritorious to offer prayers to Lord Surya on the day. There is a Ravi Dasami Parv on January 22, 2017.
Early morning prayers to rising sun and chanting of Gayatri mantra are performed on the day.
Some devotees also take holy morning dip on the day in sacred rivers, ponds, lakes and sea.