What is a Śrāddha tithi calculator?

It finds the ancestral lunar tithi at Aparāhṇa on the death date for your city—the key used for Masikam, Oona Masikam, Abdikam, and Thivasam.

Māsikam is the monthly ancestral rite on that death tithi each lunar month until the first annual Abdikam.

What are the four Oona Masikam rites?

Prathama Oona (days 28–30, some families also day 21), Traipakshika (41–45), Oona Shan Masikam (171–180), and Unabdikam / Oonabdika (341–355).

What is Abdikam or Thivasam?

Abdikam / Thivasam is the annual death-anniversary śrāddha on the same ancestral tithi. Unabdikam is the Oona rite just before it.

Which days are avoided for Oona rites?

Common guidance avoids Tuesday, Friday, and Saturday; avoids Prathamai, Caturthī, Ṣaṣṭī, Navamī, Ekādaśī, and Caturdaśī; avoids the Karthā’s birth nakṣatra; and avoids Dvi-/Tri-puṣkara yoga.

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Shraddha tithi, Masikam & Oona Masikam calculator

Masikam calculator for monthly shraddha tithi, Oona Masikam, Abdikam and Thivasam (death anniversary) dates at Aparahna for your city. Set your city in the header so Aparāhṇa timings match your place.

What this calculator finds

Śrāddha tithi — the Aparāhṇa ancestral lunar day on the death date (Tamil: cirātta titi), used for every later rite.

Masikam (Māsikam) — monthly śrāddha on that tithi until the first Abdikam / Thivasam year.

Oona Masikam (Ūṉa Māsikam) — four day-count windows: Prathama, Traipakshika, Shan, and Unabdikam, with weekday, tithi, Karthā-star, and Dvi-/Tri-puṣkara filters.

Calculate Śrāddha dates

Place: Set location in the header

Need tīṭṭu days first?

Death dateKarthā birth nakṣatra(optional)

Also evaluate the 21st-day Prathama Oona tradition (some families)

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FAQ

What is a Śrāddha tithi calculator?: It finds the ancestral lunar tithi at Aparāhṇa on the death date for your city—the key used for Masikam, Oona Masikam, Abdikam, and Thivasam.
What is Māsikam?: Māsikam is the monthly ancestral rite on that death tithi each lunar month until the first annual Abdikam.
What are the four Oona Masikam rites?: Prathama Oona (days 28–30, some families also day 21), Traipakshika (41–45), Oona Shan Masikam (171–180), and Unabdikam / Oonabdika (341–355).
What is Abdikam or Thivasam?: Abdikam / Thivasam is the annual death-anniversary śrāddha on the same ancestral tithi. Unabdikam is the Oona rite just before it.
Which days are avoided for Oona rites?: Common guidance avoids Tuesday, Friday, and Saturday; avoids Prathamai, Caturthī, Ṣaṣṭī, Navamī, Ekādaśī, and Caturdaśī; avoids the Karthā’s birth nakṣatra; and avoids Dvi-/Tri-puṣkara yoga.