The following is excerpted from Tibetan Astrology by Philippe Cornu, pages 180-183
In the course of the month, the moon makes different aspects to the sun, and these may be either favorable or unfavorable. This is what gives the days their particular character. In the Indian, Chinese, and Arab traditions, there are lists showing the characteristics of the phases of the moon and the lunar days, and similar lists are also found in Western magic.
The following list shows the general characteristics of each day. [See our article on special days for the more practice-oriented aspects of each day]
You can also read a brief overview of the system of Tibetan astrology in The Treasury of Knowledge: Book Six, Parts One and Two.
1st Day
Favorable day, excellent for offerings and petitions, for taking vows, for religious practices and obtaining what one desires. Excellent for marriage, acquisitions, teachings, blessings, initiations, and construction.
2nd Day
Favorable day—the same qualities and activities as the first day, but unproductive. Nothing should be done between midnight and 3:00 A.M.
3rd Day
Favorable day for starting a building, for vigorous activities, and for obtaining a high position.
4th Day
A generally unfruitful day. There is a need to employ a great deal of skill and intelligence in order to avoid being defeated in competition.
5th Day
This is a day of very bad reactions. Failure in moral and virtuous actions, immorality.
6th Day
Inauspicious for journeys.
7th Day
Auspicious for journeys.
8th Day
This is a day of emotional disturbance, very bad reactions, violence, and anger. It is unfavorable to morality and promotes evil acts.
9th Day
This is an excellent day for long journeys, marriage, blessings, teachings and transmissions of power (initiations), and all major undertakings. It is good for building and ceremonies.
10th Day
This is a fruitful day for journeys and excellent for marriage, acquisitions, teaching, initiations, blessings, ceremonies, offerings, and construction. Masculine energy is at its strongest on this day.
11th Day
An excellent day for firm action, for beginning a building, or for obtaining a high position. Spiritual activities are favored.
12th Day
This is a day of wisdom.
13th Day
This is a day of speed, clarity, skill, and intelligence. Skillful actions are successful.
14th Day
This is not a favorable day for journeys.
15th Day
This is a bad day for journeys. It is an unproductive day on which many expected developments fail to take place. Nothing should be attempted between midnight and 3:00 A.M. This is a powerful day for meditation.
16th Day
This is a day of competition, speed, clarity, skill, and intelligence. Generally, it is a good day.
17th Day
This is a dangerous day on which there are very bad reactions. Obstacles are placed before morality and virtue.
18th Day
This is also a dangerous day and unfavorable for morality.
19th Day
This is a moderately good day for beginning anything. It is quite favorable for marriage, acquisitions, teachings, initiations, blessings, construction, and ceremonies.
20th Day
This is an excellent day for firm and vigorous actions, for starting a building, or for obtaining a high position. It is also favorable for contracts.
21st Day
This is a bad day for journeys.
22nd Day
This is a favorable day for journeys.
23rd Day
This is a day on which to cultivate firm and careful action. It is favorable for beginning a construction or obtaining promotion.
24th Day
This is an excellent day for journeys. Activities are fruitful on this day. It is favorable for marriage, acquisitions, initiations, and blessings. Construction and ceremonies are favored.
25th Day
This is a fruitful day for journeys. On this day, feminine energy is at its strongest. It is a day of speed, clarity, skill, and intelligence and brings success in competitions.
26th Day
This is a favorable day for offerings and making requests to high personages. It is good for taking vows and for spiritual practices and religious ceremonies. On this day, one obtains one’s desires.
27th Day
This is a day of wisdom.
28th Day
This day brings success to activities.
29th Day
This is not a favorable day for journeys.
30th Day
This is a not a favorable day for journeys.