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## Chapter 5: The Five Great Vows
### Verse 270:
**Both times, study is to be done.**
**Meaning:** The **Pradoshik** (evening), **Vairaatrik** (night), and **Gousargik** (day) times are divided into two parts: the **Purvakal** (early) and **Aparakal** (late). Study should be done in both these times of the day and night.
**Explanation:** The **Pradoshik** time is the time near the end of the day, when the sun is setting. The **Vairaatrik** time is the two hours after midnight. The **Gousargik** time is the two hours before noon. Study should be done in all these times except the **Pradoshik** time.
### Verse 271:
**When starting study, know the seven-foot shadow of the thighs. And when the sun sets, end study when the shadow is seven feet.**
**Meaning:** When starting study, the shadow of the thighs should be seven feet long. When the sun sets, study should be ended when the shadow of the thighs is again seven feet long.
### Verse 272:
**In Ashadha, the shadow is two feet long at noon. In Chaitra, it is four feet long. It increases and decreases by two angulas each month.**
**Meaning:** In the month of Ashadha, the shadow of a person is two feet long at noon. In the month of Chaitra, it is four feet long. The length of the shadow increases and decreases by two angulas (finger widths) each month.