Ephemerides

Definition

Ephemerides are tables or digital datasets listing the calculated positions of celestial bodies at regular intervals, usually for each day at a specified time. The singular form is ephemeris. Astrologers consult them to locate the Sun, Moon, planets, lunar nodes, and other chart factors by zodiacal degree, often alongside information about retrograde motion and declination.

Astrological Meaning

An ephemeris is a reference tool rather than a chart interpretation. It provides the astronomical data needed to calculate natal charts, identify transits, track planetary stations, and determine when aspects become exact. Traditional printed ephemerides may use symbols and compact columns, while modern software performs the same calculations automatically. Accurate use requires attention to the stated time standard, zodiac type, date, and coordinate conventions. House cusps generally require additional tables or chart-calculation methods because they depend on location and birth time.

Why It Matters

Learning to read ephemerides helps astrologers verify software results and observe planetary cycles directly. They make it easier to see how long a planet remains in a sign, when it changes direction, and which degrees it crosses. This supports more precise timing and encourages interpretation based on actual planetary positions rather than approximation. Ephemerides are especially valuable when researching historical charts or comparing techniques from different astrological traditions.

Related Encyclopedia Entries

• Traditional Astrology
• Astrological Terminology
• Natal Chart