The famous Gayatri Mantra is addressed to the solar deity named Savitri.

Explanation:
The Gayatri Mantra is one of the most sacred and powerful mantras in Hinduism. It is a verse from the Rigveda and is dedicated to the worship of the Sun or Surya. The mantra is composed in the Sanskrit language and is chanted to invoke the blessings of the solar deity for wisdom, enlightenment, and spiritual guidance.

The Gayatri Mantra is as follows:

ॐ भूर्भुवः स्वः
तत्सवितुर्वरेण्यं
भर्गो देवस्य धीमहि
धियो यो नः प्रचोदयात् ॥

Om Bhur Bhuvah Svah
Tat Savitur Varenyam
Bhargo Devasya Dheemahi
Dhiyo Yo Nah Prachodayat

In this mantra, the deity Savitur is invoked. Savitur is often identified with the solar deity Surya, who is considered the physical manifestation of the Sun. However, it is important to note that the Gayatri Mantra is not exclusively addressed to Surya but to the solar deity in general. Savitur represents the divine light and wisdom that is associated with the Sun.

The Gayatri Mantra is considered a universal prayer that can be chanted by anyone, regardless of their religious beliefs. It is believed to purify the mind, awaken the intellect, and lead the practitioner towards spiritual enlightenment. The mantra is also associated with the awakening of the third eye or the inner eye, which is believed to provide insight and intuition.

In conclusion, the famous Gayatri Mantra is addressed to the solar deity named Savitri, who represents the divine light and wisdom associated with the Sun. While Savitri is often identified with Surya, the mantra is not exclusively addressed to Surya but to the solar deity in general.