A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?A.The motion of the apparent sun is along the eclipticB.Measurement of time is along the celestial equatorC.The speed of the Earth's revolution is not constantD.There are variations in the Earth's rotational speed
A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?
A.The motion of the apparent sun is along the ecliptic
B.Measurement of time is along the celestial equator
C.The speed of the Earth's revolution is not constant
D.There are variations in the Earth's rotational speed
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多选题Which two statements are true regarding the use of NTP clock synchronization?（）AThe Junos OS supports client, server, and symmetric modes of NTP operation.BSynchronized time on all network devices makes log messages more useful for troubleshooting.CAuthentication methods are not supported.DThe Junos OS must be used as the primary time reference.
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