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The period of one revolution of the earth around the sun, from perihelion to perihelion, averaging 365 days, 6 hours, 13 minutes, 53.0 seconds in 1900, and increasing at the rate of 0.26 second per century.

Related Terms

PERMANENT BENCHMARK

A readily identifiable, relatively permanent, recoverable benchmark that is intended to maintain its elevation without change over a long period of time with reference to an adopted datum, and is located where disturbing influences are believed to be negligible.

PEAK LOAD

1. The maximum instantaneous load or the maximum average load over a designated interval of time. Also known as peak power. 2. The maximum quantity of a specified material to be carried by a conveyor per minute in a specified period of time.

PASSIVE ACCOMMODATION

The alteration in the positioning or motion of the end point of a robot manipulator that results from 393 patent path computation an invention for a limited period of time. Also known as letters patent.

MERIT PAY PLAN

Work performed for a set hourly wage that varies from one pay period to another as a function of the worker's productivity, but never declines below a guaranteed minimum wage.

MAINTAINABILITY

1. The ability of equipment to meet operational objectives with a minimum expenditure of maintenance effort under operational environmental conditions in which scheduled and unscheduled maintenance is performed. 2. Quantitatively, the probability that an item will be restored to specified conditions within a given period of time when maintenance action is performed in accordance with prescribed procedures and resources.

LOST TIME

[ENG ACOUS] The period in a frequency-modulation sonar, just after flyback, during which the sound field must be reestablished; its duration equals travel time of the signal to and from the target.

INTEGRATING FREQUENCY METER

An instrument that measures the total number of cycles through which the alternating voltage of an electric power system has passed in a given period of time, enabling this total to be compared with the number of cycles that would have elapsed if the prescribed frequency had been maintained. Also known as master frequency meter.

INTEGRATING METER

An instrument that totalizes electric energy or some other quantity consumed over a period of time.

INSTANTANEOUS DETONATOR

A type of detonator that does not have a delay period between the passage of the electric current through the detonator and its explosion.

INDEX OF WORK TOLERANCE

A measure of the period of time during which an individual can perform a given task with the required efficiency while maintaining appropriate levels of physiological and emotional well-being.

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