The problem
You look up Gowri Panchangam and find a good window. Then you check Rahu Kalam, and it falls right on top. Which one wins?
This is one of the most asked questions in Tamil time planning. And the answer is clear: Rahu Kalam wins. A good Gowri segment that falls within Rahu Kalam is considered compromised. You should choose a different good segment instead.
This does not mean the whole day is ruined. There are four good Gowri segments during the day, and even on the worst weekday, at least two of them are untouched by all three avoid-windows.
Why it happens, and why it is not random
Gowri Panchangam and Rahu Kalam share the same basic structure: daylight is divided into eight equal parts. Rahu Kalam is one of the eight parts. Gowri lays eight names across the same parts. Therefore each avoid-window always corresponds to exactly one Gowri segment.
Which Gowri segment Rahu hits depends only on the weekday, it is a fixed mathematical property of the rotations. It applies to all cities, all seasons, all years. The clock times change, but the overlap never does.
The overlap chart, all seven days
The table shows which Gowri quality each avoid-window lands on. A red mark (✗ Good) means a good segment is compromised.
| Weekday | Rahu Kalam | Yamagandam | Kuligai |
|---|---|---|---|
| Sunday | Laabham Good | Arogara, Bad | Visham, Bad |
| Monday | Visham, Bad | Udvegam, Bad | Rogam, Bad |
| Tuesday | Laabham Good | Udayam Good | Amirtham Good |
| Wednesday | Visham, Bad | Udayam Good | Amirtham Good |
| Thursday | Arogara, Bad | Laabham Good | Shubham Good |
| Friday | Visham, Bad | Shubham Good | Arogara, Bad |
| Saturday | Udvegam, Bad | Udayam Good | Visham, Bad |
The best and worst days
Monday is the only day where no avoid-window hits a good segment. Tuesday is the only day where all three do.
| Weekday | Good segments compromised | Untouched good segments |
|---|---|---|
| Monday | 0 of 4 | 4 of 4 |
| Sunday | 1 of 4 (Rahu) | 3 of 4 |
| Friday | 1 of 4 (Yama) | 3 of 4 |
| Saturday | 1 of 4 (Yama) | 3 of 4 |
| Wednesday | 2 of 4 (Yama + Kuligai) | 2 of 4 |
| Thursday | 2 of 4 (Yama + Kuligai) | 2 of 4 |
| Tuesday | 3 of 4 (all three) | 1 of 4 |
Even on Tuesday, the hardest day, there is still one untouched good Gowri segment: Shubham, which falls in segment 1 (at sunrise). No day is entirely without a good window.
Worked example, Tuesday 13 January 2026
Tuesday is the most difficult day. Let us see what happens.
Worked example
Tuesday 13 January 2026, Chennai
Sunrise: 06:34. Sunset: 18:00. We show all eight Gowri segments and the three avoid-windows.
- Segment 1
- Shubham (good) 06:34–08:00
- Segment 2
- Rogam (bad) 08:00–09:25
- Segment 3
- Udayam (good) 09:25–10:51
- Segment 4
- Arogara (bad) 10:51–12:17
- Segment 5
- Amirtham (good) 12:17–13:43
- Segment 6
- Visham (bad) 13:43–15:09
- Segment 7
- Laabham (good) 15:09–16:35
- Segment 8
- Udvegam (bad) 16:35–18:00
UNTOUCHED, the only completely free good segment.
Hit by Yamagandam.
Hit by Kuligai.
Hit by Rahu Kalam.
Only one untouched good window: Shubham 06:34–08:00. All three avoid-windows hit a good segment each.
What to do in practice
- Always check the Gowri table and Rahu Kalam together, not separately.
- Choose a good Gowri segment that is not hit by any avoid-window.
- If you have free choice of day, prefer Monday (no overlap) or Friday/Saturday (only one).
- If you are stuck on a Tuesday, use the early morning segment (Shubham), it is always untouched.
- Remember: Rahu Kalam only applies to new beginnings. Ongoing routine is not affected, regardless of overlap.