Find Your Chandrashtama Days
Check quickly by moon sign — or use birth details for critical-window precision.
What is Chandrashtama?
Chandrashtama literally means "Moon in the 8th". Every 27 days, the transiting Moon enters the 8th zodiac sign from your birth Moon sign (Janma Rashi). Since the Moon rules the mind and the 8th house rules sudden changes, obstacles, and anxieties, this transit is traditionally considered challenging.
During this 2.25-day window, you might feel emotionally drained, easily irritated, or prone to misunderstandings. Vedic astrology advises against starting new ventures, signing important documents, or making life-altering decisions during these days.
What to Do and Avoid (Parihara)
✓ What to Do
- • Focus on routine, low-risk tasks
- • Engage in meditation and spiritual practice
- • Chant the Moon mantra (Om Som Somaya Namah)
- • Stay calm and avoid arguments
✕ What to Avoid
- • Starting new business ventures
- • Signing important legal contracts
- • Auspicious ceremonies like marriage
- • Impulsive decisions driven by emotion
How This Is Calculated
Timings are computed from the sidereal (nirayana) Moon position using the Lahiri (Chitrapaksha) ayanamsha. The "By Moon Sign" option finds every window when the Moon transits the 8th sign from your Janma Rashi. The "By Birth Details" option derives both your moon sign and birth nakshatra from your chart — adding the most sensitive ~1-day critical window (the 16th nakshatra phase).
Frequently Asked Questions
What exactly is Chandrashtama?
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Chandrashtama refers to the period when the transiting Moon moves through the 8th house from your birth Moon sign (Janma Rashi). Since the Moon governs the mind and emotions, its placement in the challenging 8th house brings temporary emotional turbulence, anxiety, and a tendency to make poor decisions.
How long does Chandrashtama last?
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The Moon takes approximately 2.25 days (or about 54 hours) to transit through a single zodiac sign. Therefore, the broad Chandrashtama window lasts for 2.25 days. However, the most critical phase occurs when the Moon transits the exact 16th Nakshatra from your birth star, which lasts about 1 day.
Should I avoid all work during this time?
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No, Chandrashtama is not a reason to stop your daily routine. You can continue normal work, regular tasks, and routine chores. You should only avoid making major life decisions, starting new businesses, signing critical contracts, or holding major auspicious ceremonies (like marriage) during this window.
Are there any exceptions or remedies?
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Yes. If the Moon is accompanied by a benefic planet like Jupiter, or if Jupiter aspects the 8th house, the negative effects are significantly reduced (Neecha Bhanga). As a personal remedy, chanting the Moon mantra ("Om Som Somaya Namah"), meditating, and avoiding arguments are the most effective ways to navigate these two days.
This tool is for general guidance. For a personal reading, consult a qualified astrologer.
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