Nirvana

Nirvāṇa (/nɪərˈvɑːnə, -ˈvænə, nər-/;Sanskrit: निर्वाण nirvāṇa  [nirʋaːɳə]; Pali: निब्बान nibbāna ; Prakrit: णिव्वाण ṇivvāṇa ) literally means "blown out", as in a candle. It is most commonly associated with Buddhism.

In the Buddhist context, nirvana refers to the imperturbable stillness of mind after the fires of desire, aversion, and delusion have been finally extinguished. In Hindu philosophy, it is the union with Brahman, the divine ground of existence, and the experience of blissful egolessness.

In Indian religions, the attainment of nirvana is moksha, liberation from samsara, the repeating cycle of birth, life and death.

Etymology

The word nirvāṇa is from the verbal root √vā “blow” in the form of past participle vāna “blown”, prefixed with the preverb nis meaning “out”. Hence the original meaning of the word is “blown out, extinguished”. Sandhi changes the spelling: the v of vāna causes nis to become nir, and then the r of nir causes retroflexion of the following n: nis+vāna > nirvāṇa. The term is used in the sense of “dead” in the Mahābhārata (i.e. “life extinguished”). [Monier-Williams Sanskrit English Dictionary sv nirvāṇa]

Moon

The Moon (in Greek: σελήνη Selene, in Latin: Luna) is Earth's only natural satellite. It is one of the largest natural satellites in the Solar System, and, among planetary satellites, the largest relative to the size of the planet it orbits (its primary). It is the second-densest satellite among those whose densities are known (after Jupiter's satellite Io).

The Moon is thought to have formed approximately 4.5 billion years ago, not long after Earth. There are several hypotheses for its origin; the most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.

The Moon is in synchronous rotation with Earth, always showing the same face with its near side marked by dark volcanic maria that fill between the bright ancient crustal highlands and the prominent impact craters. It is the second-brightest regularly visible celestial object in Earth's sky after the Sun, as measured by illuminance on Earth's surface. Although it can appear a very bright white, its surface is actually dark, with a reflectance just slightly higher than that of worn asphalt. Its prominence in the sky and its regular cycle of phases have, since ancient times, made the Moon an important cultural influence on language, calendars, art, and mythology.