Lunations — the Moon’s cycle
The oldest clock is the one overhead. Long before calendars, people counted time by the Moon swelling to full and thinning to dark — the same cycle, over and over, about twelve and a half times a year. Astrology reads that cycle as timing: a lunation is a New or Full Moon, and the arc between them is a built-in rhythm for beginning, building, harvesting, and letting go.
The breath of the month
A lunation is really a meeting between two lights. The New Moon is the moment the Moon and the Sun sit at the same degree — a conjunction, the Moon invisible, swallowed in the Sun’s glare. The Full Moon is two weeks later, when the Moon swings to the opposite point of the zodiac — an opposition, the Moon fully lit because it faces the Sun across the sky. From one New Moon to the next is about 29 and a half days: one full breath in, one full breath out.
The waxing arc
The half of the cycle from New to Full is waxing — the light growing. It runs from the New Moon (a seed dropped in the dark), through the first quarter (a quarter-turn on, when the plan meets its first resistance and has to push), up to the Full Moon (culmination — the thing revealed in full light). This is the outward, building half: the time to start, to act, to grow something toward visibility.
The waning arc
From Full back to dark, the Moon is waning — the light receding. It moves through the last quarter (a crisis of conscience, the time to prune what isn’t working) down to the balsamic dark before the next New Moon: release, rest, surrender. This is the inward, distilling half. Where the waxing arc is for doing, the waning arc is for finishing, forgiving, and clearing the ground.
Working the cycle
Used as timing, the cycle is simple. Plant at the New Moon — set intentions, begin, sow. Harvest and see clearly at the Full Moon — reap, celebrate, or face what’s come to a head; feelings run high because the Sun and Moon are pulling from opposite ends. Then, on the waning arc, release. The sign the lunation falls in tints the theme — a New Moon in Aries seeds courage and beginnings, a Full Moon in Scorpio brings something buried to the surface — and if it lands on a planet in your own birth chart, that part of your life is where the cycle does its work.
Eclipses — lunations amplified
An eclipse is a lunation turned up to full volume. It happens when a New or Full Moon falls close to one of the lunar nodes — the two points where the Moon’s tilted path crosses the Sun’s, known in astrology as Rahu and Ketu. A New Moon near a node is a solar eclipse; a Full Moon near a node is a lunar eclipse. They arrive in eclipse seasons about every six months, two or three at a time, and feel faster and more fated than an ordinary lunation — beginnings and endings that seem to move without your permission. Astrology reads them as accelerators: doors that open or close on their own schedule, not yours.
The Vedic view — tithi
Vedic astrology divides the lunar month even more finely into tithis — thirty lunar “days,” each a twelve-degree step the Moon gains on the Sun. The New Moon is Amavasya, the Full Moon Purnima, and much of Hindu ritual life is timed to the tithi rather than the solar date. The nodes that cause eclipses, Rahu and Ketu, are treated as shadow-planets in their own right — which is why, in the Vedic eye, an eclipse is not just a bright coincidence but a charged, karmic hinge in time.