The Sun beeja mantra is "Om Hram Hreem Hraum Sah Suryaya Namah". The classical count is 7,000 repetitions, built up over weeks from one mala of 108 a day, and Sunday is its day.
Mantra is the safest of the classical remedies: it can be started today, costs nothing, and cannot be worn against the chart the way a stone can. The Sankhya — the prescribed number of repetitions — is completed over weeks, beginning with one mala of 108 a day and building up. Sincerity matters more than arithmetic.
The Surya mantra is chanted at sunrise, facing east, traditionally while offering water — the arghya that goes with it is half the remedy.
The corpus describes an ill-placed Sun as low self-esteem, absent energy and confidence, and friction with authority and with the father. That is the pattern these practices address.
The classical Sankhya is 7,000 repetitions, completed over weeks rather than at once. Begin with one mala — 108 — a day and build up; sincerity matters more than arithmetic.
Sunday. Fasting, charity and mantra japa for Sun all belong to that day.
The mantra, the weekday fast and the charity are safe for anyone — they address Sun without amplifying it. Ruby is not: a planetary gem strengthens whatever the graha is already doing, so it needs a chart reading first.