Chitra Purnima: This fast is observed on the full moon day of the Hindu month of Chaitra (March-April).
Vaishakha Purnima: This fast is observed on the full moon day of the Hindu month of Vaishakha (April-May).
Shravana Purnima: This fast is observed on the full moon day of the Hindu month of Shravana (July-August).
Kartik Purnima: This fast is observed on the full moon day of the Hindu month of Kartik (October-November).
The rules for observing a purnima fast may vary, but generally, devotees abstain from eating grains, pulses, and non-vegetarian food during the fast.