Most Vedic apps show the same Rahu Kaal for all of India, calculated from a generic IST formula. But Rahu Kaal is 1/8th of the actual daytime from today's sunrise at your location. Pacific Standard Time (PST, UTC-8) in winter, Pacific Daylight Time (PDT, UTC-7) in summer CosmosPandit uses precision astronomy (Jean Meeus, Astronomical Algorithms) to calculate the exact sunrise at San Francisco's coordinates (37.774900°N, -122.419400°E), giving you the correct Rahu Kaal every day.
Rahu Kaal is the roughly 90-minute window each day ruled by the shadow planet Rahu, traditionally avoided for starting anything new, travel, deals, purchases, or ceremonies. It is the eighth part of the daytime (sunrise to sunset), and which part it falls in is fixed by the weekday, so the clock time shifts daily and by city.
The San Francisco Bay Area, encompassing San Francisco, San Jose, Sunnyvale, Fremont, and the Silicon Valley corridor, is home to over 500,000 Indians, the largest concentration of Indian tech professionals anywhere in the world. At companies like Google, Apple, Microsoft, Amazon, Meta, and thousands of startups, Indian engineers and executives are overrepresented relative to any demographic. The Indian communities of Fremont (one of the highest Indian-American population percentages of any US city), Sunnyvale, Milpitas, and San Jose have vibrant temples (the Shiva-Vishnu Temple in Livermore draws thousands), Indian grocery stores, and cultural organisations.
San Francisco uses Pacific Time, PST (UTC-8) in winter and PDT (UTC-7) in summer, which is 13.5 hours behind IST in winter and 12.5 hours behind in summer. This is the largest IST-offset error of any major Indian diaspora city. An IST-based app shows Bay Area residents a Rahu Kaal that is more than half a day off. Sunrise ranges from 5:47 AM in June to 7:27 AM in December, a 100-minute seasonal variation. CosmosPandit calculates from San Francisco's exact coordinates (37.7749°N, 122.4194°W).
The Bay Area Indian community is heavily Gujarati (particularly in the Fremont-Milpitas corridor), Telugu (the Andhra and Telangana tech professional community), Hindi, Tamil, Punjabi, and Marathi. CosmosPandit serves all 8 Indian languages with Bay Area-correct timings.
San Francisco's Pacific Time is 13.5 hours behind IST in winter (PST, UTC-8) and 12.5 hours behind in summer (PDT, UTC-7). This is the maximum IST-offset error in our city network, IST-based apps are effectively showing a different day's Rahu Kaal. The DST switch (second Sunday March and first Sunday November) also shifts the displayed time by an hour. CosmosPandit handles both the astronomical sunrise and DST automatically.
During Rahu Kaal, residents of San Francisco should avoid launching new business ventures, signing contracts, or starting important negotiations. Major financial decisions such as taking out loans, buying property, or purchasing vehicles in the Bay Area real estate and auto markets are best postponed. Planning weddings, beginning long journeys, or making significant travel arrangements during this period is strongly discouraged. Vedic astrology traditions caution that activities initiated under Rahu Kaal may face unexpected obstacles or unfavorable outcomes.
San Francisco locals can use Rahu Kaal productively by continuing ongoing work projects and completing routine daily tasks without worry. This period is considered auspicious for prayer, meditation, and chanting mantras dedicated to Rahu, such as the Rahu Beej mantra. Spiritual practices, charity, and feeding birds like crows are traditional Rahu remedies that carry positive merit during this time. Planning and brainstorming future goals is also perfectly fine, as long as no formal steps or commitments are initiated until Rahu Kaal has passed.
India uses a single timezone (IST, UTC+5:30) across 30° of longitude. But sunrise follows the sun, not the clock, every 1° of longitude, 4 minutes difference. Kolkata’s sunrise is 80 minutes earlier than Mumbai’s on the same IST day, so Rahu Kaal falls at genuinely different times in each city.
This Rahu Kaal page is just the start. The CosmosPandit app gives every Indian the full Vedic astrology toolkit, in their own language, with timings precise for their city:
Yes. California uses Pacific Time, PST (UTC-8) in winter and PDT (UTC-7) in summer. The switch happens on the second Sunday of March (clocks spring forward) and first Sunday of November (clocks fall back). CosmosPandit uses the America/Los_Angeles timezone which handles this automatically, you always see correct San Francisco clock times.
Very close. The Bay Area cities are geographically clustered, so their sunrise times differ by only 1–3 minutes. For most practical purposes, San Francisco timings apply to the whole Bay Area. Download the CosmosPandit app and set your exact city for the most precise calculation, the app supports any location worldwide.
IST is UTC+5:30. San Francisco is UTC-8 (PST) or UTC-7 (PDT). The offset is 13.5 to 12.5 hours. An IST-based app converts a Delhi 7:30 AM Rahu Kaal to 'previous day 6:00 PM San Francisco time', completely wrong. This is why CosmosPandit recalculates from actual SF sunrise: the answer isn't a conversion, it's a completely independent calculation.
Astronomically precise Rahu Kaal timings for 25 major Indian cities.