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The Iranian calendar (Solar Hijri) is a solar calendar, beginning precisely on the March equinox Wikipedia . Because it is based on the Earth's orbit around the sun, it is considered one of the most accurate calendar systems, often matching the astronomical vernal equinox with high precision ALTA Language Services .

The Gregorian (Miladi) calendar is the most widely used civil calendar in the world. It is the standard for international business, banking, travel bookings, and digital platforms. tarikh shamsi b miladi better