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Sidereal vs. Tropical
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Hot Topics in Astrology

  1. What's the difference between the Sidereal zodiac and the Tropical zodiac?
  2. Why is this a hot topic in Astrology?

What's the difference between the Sidereal zodiac and the Tropical zodiac?

The Sidereal zodiac is a physical reality depicting commonly acknowledged pictures made up of groups of stars used by astronomers, Vedic and Sidereal astrologers. The Tropical zodiac is a mathematical construct used by astrologers only.

Most people in the Western Hemisphere think of their astrological signs based on the Tropical zodiac, which is a math only based system of division with the zero point starting at the Vernal Equinox. On March 20, 2004 when the Sun crosses the ecliptic, it’s the first day of Spring in the Northern Hemisphere. New babies born on the following day will be told that they have an Aries Sun sign. And they will Tropically. All the Tropical astrologers will mark out the 12 signs, Aries to Pisces, 30 degrees each, from that point in space.

If you could see where the Sun actually was, you would see it in the 7th degree of the constellation Pisces. Sidereal Astrologers use the physical Zodiac which consists of 12 constellations. So if you were born on March 20 or 21, the Sun is physically in the Sign Pisces, not the constellation Aries.

What does this mean to you? Well, it might explain why you weren’t like all those other “Aries” born at the end of the month. But then again, you could have other planets in Aries that gives you the giddy-up that we associate with Aries. You need to see your birth chart to know how many planets are in each constellation. Look at both and see for yourself which makes more sense to you.

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Why is this a hot topic in Astrology?

It’s called a “hot topic” because astrologers are, as a rule, egotistical and put great emphasis on being correct. When another astrologer uses a different zodiac or house system to prove something… well, we can’t both be right? Can we?

Astrologer Deborah Dillard

God help the newcomer among us with no particular affinity or knowledge of zodiacs and house systems. We circle like lobbyists, calculating just the right time to pounce and lead the novice to our camp, where she will be wined and dined and shown the obvious virtue of our system.

And yes, the above description of astrologers includes me. And since I can’t wine and dine you in person, let me lobby your admiration in one of three ways.

First, if you want to do the work yourself: Get two charts done and look up the information in a basic astrology book yourself. I will recommend the using Tropical Placidus and Sidereal Whole Sign Houses. They are the most popular calculations the world over and you will stand a better chance of discussing these charts with experienced astrologers without being made to feel like you walked into a room with something unpleasant on the bottom of your shoe.

Second, if you are curious about the different personality differences portrayed by the two zodiacs but don’t want to do the work involved, then take the Zodiac Challenge. When you get the two different personality thumb sketches have a friend read them to you, and you pick out which better describes the real you.

The third way to test the zodiacs is also a shameless plug for my services. Have me do your chart with interpretation or predictions as I usually do. This will be especially effective from the predictive timing standpoint. Either something is happening in a certain area of you life or it’s not. Astrologers may be able to read the same kind of event in a chart using both zodiacs, but 93 percent of the time, the events will be said to be happening in two different areas of life. That’s why Tropical astrologers tend to be less specific in their predictions. They have to be and still have their zodiac make sense to them. (Believe me, I know. I was a Tropical astrologer for 15 years before I switched to Sidereal.)

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