Meeting Planner App for iOSFind time seasoning best time for a web meeting across time zones. Andrew Fazekas from Astronomers Without Borders picks out five cosmic events to look forward to this year. While New Year’s Day is a public holiday on January 1, many Ukrainians still celebrate the “Old New Year”, or Orthodox New Year, which is on January 14 in the Gregorian calendar. In this issue:The year’s shortest day is getting longer.

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UTC is Coordinated Universal Time, GMT is Greenwich Mean Time. Show local times worldwide for your event. Moon times precise to the second. Exclusive calendar templates for PDF Calendar.

Time has long been an important subject of study in religion, philosophy, and science, but defining it in a manner applicable to all fields without circularity has consistently eluded scholars. Time in physics is operationally defined as “what a clock reads”. The physical nature of time is addressed by general relativity with respect to events in spacetime. Examples of events are the collision of two particles, the explosion of a supernova, or the arrival of a rocket ship. The operational definition of time does not address what the fundamental nature of time is.

It does not address why events can happen forward and backward in space, whereas events only happen in the forward progress of time. Investigations into the relationship between space and time led physicists to define the spacetime continuum. General relativity is the primary framework for understanding how spacetime works. Temporal measurement has occupied scientists and technologists and was a prime motivation in navigation and astronomy. Periodic events and periodic motion have long served as standards for units of time. Examples include the apparent motion of the sun across the sky, the phases of the moon, and the swing of a pendulum.