induwara.lk
Premium
induwara.lkSri Lanka · Panchang

Sri Lanka Hora Calculator — Subha Hora & Guru Hora Today

See all 24 planetary Horas (හෝරා) for any date and Sri Lankan city — each hour's ruling planet, its benefic or malefic nature, and what it is traditionally used for. Built from real sunrise and sunset. No signup, no ads, sources cited below.

By Induwara AshinsanaUpdated Jul 15, 2026
Horaහෝරා · Subha Hora for any date
Chaldean method
Quick pick
MondaySunrise06:05Sunset18:25Day Hora62 minNight Hora58 min

Day and night Horas differ in length: this day runs 12 h 20 min of daylight, so day Horas are 62 min and night Horas 58 min (the unequal-hour system).

06:0524 Horas · sunrise → sunrise23:59
Mo
Sa
Ju
Ma
Su
Ve
Me
Mo
Sa
Ju
Ma
Su
Ve
Me
Mo
Sa
Ju
Ma
Su
Ve
Me
Mo
Sa
Ju
BeneficNeutral (Sun)Malefic
Day Horas· sunrise → sunset
  • 1Moonසඳු06:05 – 07:06BeneficTravel, water matters, purchases and daily errands.
  • 2Saturnසෙනසුරු07:06 – 08:08MaleficLand, labour and long-term matters; avoid auspicious starts.
  • 3Jupiterගුරු08:08 – 09:10BeneficEducation, finance, new ventures and religious acts.
  • 4Marsඅඟහරු09:10 – 10:11MaleficProperty, litigation and machinery; avoid signings.
  • 5Sunරවි10:11 – 11:13NeutralGovernment, authority and official work.
  • 6Venusසිකුරු11:13 – 12:15BeneficMarriage, arts, vehicles and celebrations.
  • 7Mercuryබුධ12:15 – 13:16BeneficTrade, study, exams, IT and communication.
  • 8Moonසඳු13:16 – 14:18BeneficTravel, water matters, purchases and daily errands.
  • 9Saturnසෙනසුරු14:18 – 15:20MaleficLand, labour and long-term matters; avoid auspicious starts.
  • 10Jupiterගුරු15:20 – 16:21BeneficEducation, finance, new ventures and religious acts.
  • 11Marsඅඟහරු16:21 – 17:23MaleficProperty, litigation and machinery; avoid signings.
  • 12Sunරවි17:23 – 18:25NeutralGovernment, authority and official work.
Night Horas· sunset → next sunrise
  • 1Venusසිකුරු18:25 – 19:23BeneficMarriage, arts, vehicles and celebrations.
  • 2Mercuryබුධ19:23 – 20:21BeneficTrade, study, exams, IT and communication.
  • 3Moonසඳු20:21 – 21:20BeneficTravel, water matters, purchases and daily errands.
  • 4Saturnසෙනසුරු21:20 – 22:18MaleficLand, labour and long-term matters; avoid auspicious starts.
  • 5Jupiterගුරු22:18 – 23:16BeneficEducation, finance, new ventures and religious acts.
  • 6Marsඅඟහරු23:16 – 23:59MaleficProperty, litigation and machinery; avoid signings.
  • 7Sunරවි23:59 – 23:59+1 dayNeutralGovernment, authority and official work.
  • 8Venusසිකුරු23:59 – 23:59+1 dayBeneficMarriage, arts, vehicles and celebrations.
  • 9Mercuryබුධ23:59 – 23:59+1 dayBeneficTrade, study, exams, IT and communication.
  • 10Moonසඳු23:59 – 23:59+1 dayBeneficTravel, water matters, purchases and daily errands.
  • 11Saturnසෙනසුරු23:59 – 23:59+1 dayMaleficLand, labour and long-term matters; avoid auspicious starts.
  • 12Jupiterගුරු23:59 – 23:59+1 dayBeneficEducation, finance, new ventures and religious acts.
Cross-checked: after 24 Horas the cycle rolls to Mars, the lord of the next day (the following weekday) — confirming the Chaldean sequence closes correctly.

Sun times use the NOAA solar algorithm; the 12 day + 12 night Hora split and the Chaldean planet order follow the standard Panchang planetary-hours convention. A traditional time calculation, not a government schedule or a prediction.

How it works

The Hora (planetary hour) system is one of the oldest ways of naming the hours of the day. Every Hora carries a ruling planet, and the ruler steps forward through a fixed order that reaches back to Chaldean and classical Jyotiṣa astronomy. The arithmetic is deterministic; the only inputs that vary are the day's sunrise and sunset and the weekday.

  1. Resolve sunrise, sunset and the next sunrise.For the chosen date and city the tool runs the NOAA Global Monitoring Laboratory solar algorithm: Julian day → solar declination → equation of time → the hour angle for the −0.833° horizon zenith, then converts to Sri Lanka clock time (UTC+5:30). The next day's sunrise is computed the same way to close the night.
  2. Split day and night into 12 Horas each. The day Hora length is (sunset − sunrise) ÷ 12 and the night Hora length is (next sunrise − sunset) ÷ 12. Because daylight is rarely exactly 12 hours, day and night Horas differ in length — the unequal-hour system.
  3. Set the first ruler from the weekday. The first Hora after sunrise is ruled by the lord of the weekday: Sun→Sun, Mon→Moon, Tue→Mars, Wed→Mercury, Thu→Jupiter, Fri→Venus, Sat→Saturn.
  4. Step through the Chaldean order. The order is Saturn → Jupiter → Mars → Sun → Venus → Mercury → Moon. With the weekday lord at index k in that order, the ruler of Hora number n (1–24) is C[(k + n − 1) mod 7].

The tool includes a built-in cross-check. Advancing 24 Horas shifts the Chaldean index by 24 mod 7 = 3, which means the first Hora of the next day must land on the next weekday's lord — Sunday's Sun rolls to Monday's Moon, and so on. The calculator asserts this equality on every result and shows a “cross-checked” note when it holds. Each planet also carries a fixed traditional classification — Jupiter, Venus, Mercury and Moon as benefic, the Sun as neutral, and Mars and Saturn as malefic — shown only as conventional reference, never as a prediction.

Worked examples

Nominal 6 am–6 pm day, Sunday

Sunrise 06:00 · Sunset 18:00 · Next sunrise 06:00 · day & night Hora = 60 min

  1. Sunday's lord is the Sun, at Chaldean index 3.
  2. Day Hora 1 (06:00–07:00) = C[(3+0) mod 7] = Sun.
  3. Day Hora 6 (11:00–12:00) = C[(3+5) mod 7] = Jupiter — the Guru Hora.
  4. Night Hora 1 (18:00–19:00) = C[(3+12) mod 7] = Jupiter.
  5. Cross-check: Hora 25 = C[(3+24) mod 7] = Moon = Monday's lord. Passes.

Colombo, a mid-June Thursday — unequal Horas

Sunrise 05:55 · Sunset 18:27 · day Hora ≈ 62.7 min · night Hora ≈ 57.3 min

  1. Day length 752 min ÷ 12 ≈ 62.7 min; night length 688 min ÷ 12 ≈ 57.3 min.
  2. Thursday's lord is Jupiter (index 1), so Day Hora 1 is the Guru Hora.
  3. Day Hora 1 (Guru Hora): 05:55 → about 06:58.
  4. Next Jupiter Hora is Day Hora 8: about 13:14 → 14:17.
  5. Day and night Horas differ by ~5 minutes — the unequal-hour effect.

Same 6–6 day, but a Thursday — the ruler shifts

Sunrise 06:00 · Sunset 18:00 · day & night Hora = 60 min

  1. Thursday's lord is Jupiter (index 1), not the Sun.
  2. Day Hora 1 (06:00–07:00) = C[(1+0) mod 7] = Jupiter (Guru Hora at sunrise).
  3. Day Hora 8 (13:00–14:00) = C[(1+7) mod 7] = Jupiter again.
  4. Same sunrise and sunset as the Sunday example, but every ruler moves — because the weekday changed.

Frequently asked questions

Sources & references

The solar algorithm and the Chaldean Hora sequence on this page were last cross-checked on 2026-07-15, with sunrise/sunset validated against published Colombo values. This is a traditional Panchang time calculation, not a government or religious schedule, and it gives time windows and conventional significations only.

Related tools

LiveUtility

Rahu Kalaya Calculator

Calculates the daily Rahu Kalaya, Yamaganda and Gulika Kaalam time windows for any date and Sri Lankan city from real sunrise and sunset.

Open tool
LiveUtility

SL Heat Index Calculator

Enter temperature and humidity to get the heat index — the 'feels like' temperature — using the exact US National Weather Service formula, mapped to Sri Lanka Department of Meteorology advisory bands with safety guidance. Free, no signup.

Open tool
LiveUtility

SL Sunrise & Sunset Times

Exact sunrise, sunset, solar noon, day length, twilight and golden-hour times for any Sri Lankan city and date, computed with the NOAA solar algorithm in UTC+5:30.

Open tool
Rate this tool
Be the first to rate

Comments & feedback

Spotted a bug or want an improvement? Tell us — our team reviews every comment, and good ideas get built. Comments are public and anonymous.

Found a bug, edge case, or want to suggest an improvement?

Email me at [email protected] — most fixes ship within 24 hours.