This is a new feature, delivering in-page definitions within posts and pages.

**a**

- Alignments - A name special to Carnac’s three successive groups of parallel rows of stones, starting above Carnac called Le Menec, Kermario, and Kerlescan and another found near Erdevan.
- AMY - A megalithic yard which, in inches, expresses the true astronomical ratio of mean solar months to lunar months.
- azimuth - the standard angular measurement of angles on the horizon, measured clockwise from zero degrees true North.

**c**

- canevas - A technique of geometrical knowledge expressed within multiple square grids, noted and named by Schwaller de Lubicz in Pharaonic art and temple building.
- Carnac - An extensive megalithic complex in southern Brittany, western France, predating the British megalithic.
- chronon - The average excess of the day over the sidereal day, of 4 minutes, 1/365th of the Earth’s rotation, to catch up the sun.
- circumpolar observatory - A geometrical arrangement suited to the tracking the motion of circumpolar stars, around the north pole, during the night.
- Clava - A type of circular Bronze Age cairn, with a circular chamber, named after the group of three at Balnuaran of Clava, east of Inverness in Scotland.
- cromlech - Breton word for a rounded kerb monument or stone circle.
- cubit - 3/2 feet of any sort, such as 12/7 Royal feet of 8/7 feet, and sometimes, a double foot.

**d**

- Day-inch counting - The practice of counting the days, using inches or other small units, between synodic phenomena such as years or planetary loops.
- dolmen - A chamber made of vertical megaliths upon which a roof or ceiling slab was balanced.

**e**

- eclipse year - the time taken (346.62 days) for the sun to again sit on the same lunar node, which is when an eclipse can happen.
- English foot - The standard prehistoric foot (of 12 inches) representing a unity from which all other foot measures came to be formed, as rational fractions of the foot, a fact hidden within our historical metrology [Neal, 2000].

**g**

**j**

- Just intonation - A musical tuning system improving the Pythagorean system of tuning by fifths (3/2), by introducing thirds (5/4 and 6/5) to obtain multiple scales.

**l**

- Lunation Triangle - The right-angled triangle within which the lengths of the two longer sides are the relative proportions of the solar and lunar years.

**m**

- megalithic yard - A unit of length around 2.7 to 2.73 feet long
- Metonic - Greek: The continuous 19 year recurrence of the moon’s phase and location amongst the stars.
- Metrology - The application of units of length to problems of measurement, design, comparison or calculation.

**n**

- Nodal period - Usually referring to the backwards motion of the lunar orbit’s nodes over 6800 days (18.618 years), leading to eclipse cycles like the Saros.

**s**

- Saros - The dominant eclipse period of 223 lunar months after which a near identical lunar or solar eclipse will occur.
- Saturn synod - The 378 days between two retrograde loops of Saturn, equal to 54 seven-day weeks
- superparticular - a ratio in which the numerator is one greater than the denominator.
- Synodic - The recurring time cycle of a given celestial phenomenon seen from the Earth.

**3**

- 3-4-5 - The side lengths of the “first” Pythagorean triangle, special because the side lengths are successive small primes and, at Carnac, defined the solsticial extremes of the sun.