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| the fainter of the two stars that constitute a double or binary star |
| one of several hundred known celestial objects, generally believed to be rapidly rotating neutron stars, that emit pulses of radiation such as radio waves with a high degree of regularity |
| equation of time | |
| —n | |
| the difference between apparent solar time and mean solar time, being at a maximum in February (over 14 minutes) and November (over 16 minutes) | |