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| | 70 to 74 of 227 glossary terms |
| equinoctial dial: sundial where the hour plate or circle is set parallel to the equator, see article on the sundial.
| equinoctial ring dial: type of sundial, included as an equinoctial dial, comprising two pivoted rings and a bridge for adjusting for solar declination, or of three rings.
| equinox: either of two points on the celestial sphere where the equator meets the ecliptic, representing the position of the sun when it is 90 degrees from the poles, or the two dates in the year when the sun is in this position in its annual cycle.
| folding rule: see rule.
| folding rule and level: a compound instrument combining the functions of both a folding rule and level.
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