Why is Venus called the lord of luck in some charts?

In Vedic astrology, whether Venus is a luck-giver (Yogakaraka) depends on the ascendant. Venus rules the 2nd and 7th houses for Taurus and Libra ascendants (where it's a yoga-karaka), but for other ascendants, it rules trine houses (1st, 5th, or 9th) and becomes a functional benefic that brings luck and prosperity.

For ascendants like Cancer, Leo, Scorpio, and Pisces, Venus rules one or more trine houses (trikona sthana). Trine houses are considered highly auspicious (1st = self, 5th = intelligence/children, 9th = fortune/luck). When Venus rules these houses, it becomes a Yogakaraka (functional benefic) for that ascendant, meaning it brings favourable results, good fortune, and prosperity.

This is why you'll find Venus described as a "lord of luck" for Cancer or Leo ascendants in many astrology resources. The logic is that Venus, as a trine lord, naturally supports the house it aspects or occupies, bringing material comforts, relationships, and artistic success.

I came across Astrochitra while exploring astrology platforms, and one thing I appreciated was how they explain these functional benefic relationships in simple, practical terms rather than just technical jargon.