> I'm not sure how the Tropics of Cancer/Capricorn got in this discussion, they are latitudes of the earth. They are latitudes of the Earth (although the obliq

> I'm not sure how the Tropics of Cancer/Capricorn got in this discussion, they are latitudes of the earth. They are latitudes of the Earth (although the obliquity of the ecliptic can change over time, so they are not always the same latitudes of the Earth). Specifically, they are the latitudes of the Earth that the Sun will be directly above if the ecliptic longitude of the Sun is 0 Cancer and 0 Capricorn (when the Sun is at 0 Aries and 0 Libra, it is directly above the equator). > your sign is the constellation the sun was "in" when you were born It is not. "Your sign" usually means your Sun sign (at the time you were born; this can be any time of day or night), and it is not the same as a constellation, even if it has the same name as that sign. If your Sun sign is Aries, that means that the ecliptic longitude of the Sun at the time you were born was greater than or equal to zero degrees and less than thirty degrees, counting from the spring equinox as zero. That is what it means. It does not have to do with the constellation named Aries, although people who are not familiar with astrology often confuse it with that. Astrological signs are a measurement of ecliptic longitude. One sign = 30 degrees, therefore 12 signs = 360 degrees. You can also determine the sign of the Moon and planets, which would be their ecliptic longitude, like you would with the Sun. For example, if Moon is in the sign Libra then the ecliptic longitude of the Moon is greater than or equal to 180 degrees and less than 210 degrees. Libra is the opposite direction from Aries, so if Sun is Aries during a full moon, then the Moon will be Libra, since the opposite directions are 180 degrees apart. This is not having to do with the constellations named Aries and Libra, which is different.