Sankramana is the instant the Sun enters the next Nirayana Rashi. That astronomical ingress is one moment worldwide, but the local civil date, clock time and applicable Punyakala can differ because of timezone, sunrise, sunset and the traditional rule assigned to that Sankranti.
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The astronomical ingress occurs at one instant, but each timezone displays it as a different local date and clock time.
They may use different Ayanamsha settings, sunrise conventions or traditional limits for that Sankranti.
Not as a universal rule. Use the specific window calculated for that Sankranti and tradition.
It is tied to the sidereal solar ingress into Makara. Long-term precession and calendar structure can gradually affect its Gregorian placement, but this is not best treated as a simple fixed one-day rule.
This page uses the Sankramana and Punyakala rules implemented in the calculation engine. Regional Panchangas may differ, especially when ingress occurs near sunrise, sunset or during the night.
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