Saṅkrāntī—the day when a Bengali month ends. Also, the passage of the sun or any other planet from one Zodiacal sign to another.

Sahkranti-the day when a Bengali month ends. Also, the passage of the sun or any other planet from one Zodiacal sign to another.
 

Link to this page: https://prabhupadabooks.com/glossary/s/sankranti-the-day-when-a-bengali-month-ends-also-the-passage