Rahu Kalam, Yamaganda, and Gulika are recurring daytime intervals used in many Muhurta traditions. They are calculated from local sunrise and sunset, so their civil-clock times change by date and place.
They are best understood as cautions for selected beginnings, not as predictions that harm will occur.
Why online tables can disagree
A fixed chart often assumes a six-to-six day. A location-aware calculation divides the actual sunrise-to-sunset span into eight parts and assigns the weekday-specific portions.
Differences in coordinates, time-zone rules, daylight saving time, and sunrise method can shift the displayed boundary.
Practical interpretation
If you have flexibility, use these windows for ongoing, routine, corrective, or preparatory work and begin an important new undertaking outside them. Necessary responsibilities do not need to stop.
A caution window should never be used to delay urgent care, ignore safety guidance, or override a contractual deadline.
Check the full context
The three intervals do not describe every feature of a moment. A complete election may also consider Panchanga limbs, the rising sign, Choghadiya, Hora, and activity-specific rules.
When the schedule is constrained, choose the most practical time and treat the traditional label as secondary context.