In Vedic astrology, predicting the exact time of death is considered highly sensitive and complex. While it's discouraged to pinpoint the exact moment of death, astrology can give insights into potential life-threatening periods or health crises through the study of planetary positions, transits, and doshas (flaws). Here’s an overview of how death or serious health issues can be analyzed, along with key factors that astrologers look for:

Key Factors in Determining Death in Astrology:

1. 8th House (Ayushya Bhava)

   - The 8th house is the primary house associated with longevity, death, and transformation.
   - The lord of the 8th house and any planets placed in or aspecting the 8th house provide clues about the nature of death or life-threatening situations.
   - Malefic planets (Saturn, Mars, Rahu, Ketu) in the 8th house or aspecting it can indicate challenges to health and longevity.

2. 2nd House (Maraka Bhava)

   - The 2nd house is considered a "Maraka" (killer) house, as it opposes the 8th house. The planets associated with the 2nd house or its lord can indicate potential danger to life.
   - The 2nd house lord and any planets transiting through it during their dasha (major planetary period) could trigger health crises or life-ending events.

3. 7th House (Maraka Bhava)

   - The 7th house, like the 2nd, is also considered a Maraka house, associated with potential dangers to longevity.
   - Planets in or aspecting the 7th house, especially malefic ones, can indicate health challenges or accidents.

4. Saturn’s Influence (Shani)

   - Saturn is the natural significator of longevity and aging. It governs long-term illnesses, slow degeneration, and old age.
   - A malefic influence of Saturn, especially during its Sade Sati (7.5 years transit) or during its dasha, can trigger critical life periods.
   - Saturn’s placement in the 6th, 8th, or 12th house or aspecting these houses can indicate health problems or danger.

5. Maha Dasha and Antara Dasha (Major and Minor Planetary Periods)

   - The dasha system is essential in determining when life events may occur.
   - During the dasha (main period) or antara dasha (sub-period) of malefic planets like the lord of the 2nd or 7th house, or planets like Saturn, Mars, Rahu, or Ketu, there could be a higher risk of life-threatening events.
   - A strong malefic dasha combined with difficult transits is often a trigger point for significant life events, including health crises or death.

6. Transits of Malefic Planets

   - The transits of Saturn, Mars, Rahu, and Ketu over critical points in the horoscope, especially over the 8th house, 2nd house, 7th house, or their lords, can trigger challenging periods.
   - A particularly dangerous period occurs when Saturn or Mars transits over the 8th house or its lord, or if they form an aspect with each other.
   - The Saturn return (around the age of 29 or 58) can also bring significant life challenges.

7. Natural Significators of Death (Maraka Grahas)

   - Saturn (slow death), Mars (violent death, accidents), Rahu (sudden and unexpected events), and Ketu (mysterious or spiritual death) are natural significators (Karaka) of death.
   - Their involvement in the 8th or 12th house or aspects to these houses during critical transits or dashas can indicate potential risks.

8. 12th House (Vyaya Bhava)

   - The 12th house represents loss, isolation, hospitals, and the final stage of life.
   - If the 12th house is afflicted, it can indicate a likelihood of hospitalization or long-term illness before death.
   - The lord of the 12th house and its interactions with other houses, especially the 6th, 8th, or 7th houses, play a significant role in end-of-life events.

9. 6th House (Roga Bhava)

   - The 6th house governs diseases, debts, and enemies. When afflicted, especially by malefic planets, it can indicate chronic illnesses or health problems.
   - If malefic planets strongly influence the 6th house, they can trigger health issues that may lead to serious medical conditions.

10. Strength of the Ascendant and Moon

    - The Ascendant (Lagna) and the Moon represent the body and mind. A strong Lagna and Moon generally indicate good health and longevity.
    - If these are afflicted by malefics like Saturn, Mars, or Rahu, especially in transits or dashas, it can lead to critical health issues.

Types of Death and Their Astrological Indications:

- Sudden or Accidental Death: Mars and Rahu’s influence in the 8th house or their dasha periods can indicate accidents, sudden injuries, or unexpected events.
- Health-Related Death: Saturn in the 6th or 8th house or its dasha can lead to prolonged illness or chronic health issues.
- Violent Death: Mars or Ketu’s influence in the 8th house or aspecting the ascendant can indicate violence or aggressive means.
- Natural Death: A strong 8th house and its lord, along with supportive dashas, can lead to a peaceful or natural passing.

General Remedies to Prolong Life:

1. Chanting Maha Mrityunjaya Mantra: This powerful mantra dedicated to Lord Shiva is known to provide protection against untimely death.
2. Worship Lord Hanuman: Regular recitation of the Hanuman Chalisa can help in overcoming life-threatening situations, especially during Saturn’s dasha or Sade Sati.
3. Donate Black Sesame Seeds: On Saturdays, donating black sesame seeds and mustard oil can reduce the malefic effects of Saturn, Rahu, and Ketu.
4. Offer Water to Sun: Offering water to the Sun daily can strengthen the body’s vitality and protect against health crises.
5. Fasting on Saturdays: Fasting and doing charity on Saturdays can reduce the malefic effects of Saturn, which is a significant planet for longevity.

Conclusion:

Although it is possible to analyze the potential timing and nature of death in Vedic astrology, it is essential to approach the subject with caution, as predicting death is an ethically sensitive and complex matter. Rather than focusing on death, astrology often emphasizes the importance of remedies, spiritual practices, and positive actions to mitigate negative influences and enhance longevity.