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The various appearances of the moon during differ- ent parts of the synodical month. The cycle begins with new moon or change of the moon at conjunction. The visible part of the waxing moon increases in size during the first half of the cycle until full moon appears at opposition, after which the visible part of the waning moon decreases for the remainder of the cycle. First quarter occurs when the waxing moon is at east quadrature; last quarter when the waning moon is at west quadrature. From last quarter to new and from new to first quarter the moon is crescent; from first quarter to full and from full to last quarter it is gibbous. The elapsed time, usually expressed in days, since the last new moon is called age of the moon. The full moon occurring nearest the autumnal equinox is called harvest moon; the next full moon, hunter’s moon.

Related Terms


A kiln in which the cycle of setting ware in the kiln, heating up, soaking'' or holding at peak temperature for some time, cooling, and removing or drawing'' the ware is repeated for each batch.


A thermodynamic cycle for the conversion of heat into work, consisting of two isentropic phases interspersed between two constant-volume phases. Also known as spark-ignition combustion cycle.


1. The time required by a trained worker to perform a task at a normal pace. 2. The total of all the normal elemental times constituting a cycle or operation. Also known as base time; leveled time.


An element of an operation or process that does not occur in every cycle but has a frequency of occurrence that is specified by the method.


A specific measurable subdivision of a work cycle or operation that is completed entirely by hand or with the use of tools.


An element of a work cycle whose time span is long enough to be observed and measured with a stopwatch.


The proportion of an operation cycle during which the machine controls the speed of work progress.


[INDENG] Timeduringawork cycle when a machine is idle, awaiting completion of manual work.


1. The modification of a system so that its outputs are approximately linear functions of its inputs, in order to facilitate analysis of the system. 2. The mathematical approximation of a nonlinear system, whose departures from linearity are small, by a linear system corresponding to small changes in the varilimited-pressure cycle See mixed cycle.


[SYS ENG] A methodology that identifies the environmental impacts associated with the life cycle of a material or product in a specific application, thus identifying opportunities for improvement in environmental performance. Abbreviated LCA.

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