What is the Tian Shi star?

First, a common misunderstanding: Tian Shi (Heavenly Messenger) in Zi Wei Dou Shu has nothing to do with the winged angels of Western religion, even though the same Chinese word is used for both. Here "shi" means an envoy, someone who carries a message. It is a very light minor star, it sits in the same palace on every chart, and the ancients mainly used it to read luck periods. To see which branch Tian Shi falls in on your chart, draw your chart.

What kind of star is Tian Shi

The Zhu Xing Wen Da Lun chapter in volume one of the Zi Wei Dou Shu Quan Shu (The Complete Book of Zi Wei Dou Shu) discusses Tian Shi and Tian Shang in the same passage:

Tian Shang is heaven's spirit of emptiness and depletion; Tian Shi is heaven's spirit of messengers.

Volume two is more specific, saying Tian Shi "is the star of messengers, charged with looking into the causes of good and ill in human lives": like an envoy bringing word, it reminds you that something needs attention in a certain period. The same passage says that when a luck period meets it, "where auspicious stars are many, the trouble is light": with more helpful stars in the same palace, the effect is lighter.

How Tian Shi is placed

The verse for placing Tian Shang and Tian Shi in volume two of the Quan Shu:

Six places before the Life Palace is Tian Shang; six places after it, Tian Shi.

The note after the verse reads: "Tian Shang is placed in the Servants Palace, Tian Shi in the Health Palace." So by the Quan Shu, Tian Shi is always in your Health Palace and Tian Shang is always in the Friends Palace, the two flanking the Travel Palace, one on each side.

The Zhongzhou school places it differently

The Zhongzhou school holds that for yang men and yin women it goes as above, while for yin men and yang women the two swap: Tian Shi moves to the Friends Palace and Tian Shang to the Health Palace. Xingge follows the Quan Shu by default; switch to the Zhongzhou school in the chart's advanced settings and they swap by this rule. Whichever school you follow, Tian Shang and Tian Shi still flank the Travel Palace. The schools page sums up the differences between them.

Reading Tian Shi on the natal chart

Since Tian Shi is always in the Health Palace, on the natal chart it is a small footnote to that palace. Xingge's Health Palace readings only talk about stress and daily rhythm, and make no judgment about your body: with Tian Shi here, read it as your rhythm having a messenger. When your schedule gets too full or you stay tense too long, it lets you know first.

That reminder is useful. Feeling tired, short on sleep, wound up all over: take it as a signal that your schedule needs loosening, and don't wait until you can't keep going to stop. The Health Palace's main stars and transformations are the main story; Tian Shi only adds a note on the side: "slow the pace."

Reading Tian Shi in luck periods

Volume three of the Quan Shu, in its chapter on the fortunes of the ten-year period:

In both the major and minor periods, and in the year of Tai Sui, beware of walking into the place flanked by Tian Shang and Tian Shi.

When the Decade Luck or Annual Luck reaches the palace flanked by Tian Shang and Tian Shi, which is the natal Travel Palace position, the ancients were especially on guard; volume two calls it "the added flanked place." For a luck period reaching the Tian Shi palace itself, the old verse uses the story of the wealthy Shi Chong as a comparison: however deep your reserves, stay careful. The flanking palaces lesson explains how flanking is read.

Read for today, when a luck period meets Tian Shi, you can prepare like this:

• Look after your routine first. Stress tends to land on the body during this time, and steady sleep and exercise matter more than anything.
• Double-check important news. Tian Shi is the messenger star. Check what you hear and the notices you receive before you act on them.
• Go slower on big spending. For decisions that aren't urgent, give yourself a little more time.

If the same palace has Lu Cun, Hua Lu, Hua Ke, or Zuo Fu and You Bi, that is what the old text means by "where auspicious stars are many, the trouble is light," and the reminder is lighter still. The Annual Luck lesson walks through how to find which palace a year reaches.