Which form of Durgā is worshipped on each day of Navarātri?

the nine forms (Navadurgā) are Śailaputrī, Brahmacāriṇī, Candraghaṇṭā, Kūṣmāṇḍā, Skandamātā, Kātyāyanī, Kālarātri, Mahāgaurī and Siddhidātrī.

The list of nine Durgās comes from the Devī Kavaca, recited before the Saptaśatī, and in North India each day of Navarātri is dedicated to one of them in this order. Together they trace a journey: Śailaputrī, daughter of the mountain; Brahmacāriṇī in austerity; Candraghaṇṭā with the bell-shaped moon; Kūṣmāṇḍā, who smiled the cosmos into being; Skandamātā, mother of Kārttikeya; Kātyāyanī, the warrior; Kālarātri, the dark night that destroys fear; Mahāgaurī, radiant and pure; and Siddhidātrī, giver of fulfilment.

Many families offer a different naivedya each day and meditate on that day’s form. The popular custom of a colour for each day is recent and varies year to year — enjoy it if you like, but it is not essential.

In Bengal and the South, Navarātri is organised differently — around Durgā Pūjā, or three days each for Durgā, Lakṣmī and Sarasvatī. All are valid.

Source: Devī Kavaca (part of the Saptaśatī recitation) · Day 1 Śailaputrī → Day 9 Siddhidātrī

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