Astrology

Zodiac signs, numerology, biorhythms and chart basics. 16 calculators, here because people look them up, and built to be accurate to the tradition rather than to make claims for it. Astrology is not a science and these pages do not suggest otherwise.

What can be done properly is the astronomy underneath, and that part is real. Moon phase computes from the actual synodic month of 29.53 days rather than a four-week approximation, so it matches what is in the sky. Gardeners, anglers and photographers use that page far more than astrologers do.

Sun sign dates carries the detail most sign charts get wrong. The boundaries shift by a day or so year to year, because the tropical year is not 365 days exactly. Anyone born within about 24 hours of a cusp genuinely needs their birth year and time checked rather than a fixed table, and a chart that prints “August 23” as a hard line is wrong for a fair number of people.

Biorhythms are worth knowing the history of: fixed 23, 28 and 33 day cycles invented in the 1890s, tested repeatedly in the 1970s and 80s, and found to predict nothing. The page runs the arithmetic and says that plainly.