Planetary lesson
The term planetary hour in astrology means that the individual hours of the day and night are characterized in a special way according to the meaning of a planet . The first hour is calculated as the hour of the day beginning with sunrise, which is "ruled" by the planet that corresponds to the day of the week (Sunday: sun, Monday: moon, etc.), and all the following hours then alternate according to the so-called "Chaldean series".
The Chaldean series arranges the visibly changing celestial bodies from a geocentric perspective according to their increasing speed:
- Saturn ( Saturday )
- Jupiter ( Thursday )
- Mars ( Tuesday )
- Sun ( sunday )
- Venus ( Friday )
- Mercury ( Wednesday )
- Moon ( monday )
After the 24 planetary hours of a day have elapsed, the following first planetary hour now corresponds to the planet after which the following day is named.
The Hellenistic astronomer Vettius Valens had a great influence, who assigned a planet god to each hour of the day as the ruler of the hour.
Medieval and early modern doctors recommended the use of bloodletting at specific planetary hours that corresponded to the disposition of the patient or the disease.