# ''TIME'' - definitions

socratus
#1
''TIME'' - definitions
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Can ''Time'' exist without matter ?
No.
Therefore, the right definition of ''time'' is to say: ''Gravity-time''
We have Earth ''gravity-time''.
Another planets have their own ''gravity-time''
From ''gravity-time'' is possible to create another definitions of ''time''
( atomic time-clock , biological-time, local-time, psychological-time . . . . )
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Attached Images
D - TIME.jpg (5.4 KB, 0 views )

MHz
#2
Anything that has a beginning and an ending has 'time' between those two points. Divided into 10 parts makes visualizations easier to construct.

socratus
#3
Quote: Originally Posted by MHz

Anything that has a beginning and an ending has 'time' between those two points.
Divided into 10 parts makes visualizations easier to construct.

Agree,
''Time'' is artificial / mathematical measurement between a beginning and an ending.
''Time'' doesn't have ''nature''.
''Time'' is not a ''nature''.
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socratus
#4
Proper time
https://en.wikipedia.org/wiki/Proper_time
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It means, SRT plays with two kinds of time:
1- ''proper time'' --- ''independent of coordinates''
In terms of Minkowski four-dimensional spacetime,
''proper time'' is Constant on the World line
2 - ''proper time interval'' between two events
on the Word line is the changes in the ''proper time''.
This ''proper time interval'' is Relative property
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Attached Images
L - C.jpg (52.0 KB, 0 views )

socratus
#5
Antique sand watch ( hourglass ) and Minkowski Light cone
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Minkowski light cone
Light cone in 2D space plus a time dimension.
A light cone is the path that a flash of light, . . . through spacetime
(light travel from an enormous past light cone through a place
of the very tiny present to an enormous future light cone) . . .
/ look the scheme /
https://en.wikipedia.org/wiki/Light_cone
#
Antique sand watch ( hourglass )
Sand in the hourglass flows from the upper vessel (place of a past)
through very tiny hole (place of the short present life) to the lower vessel
( place of the future )
#
We can turn over the hourglass and the time will flow vice versa.
Similar: the light in an absolute Minkowski spacetime can go
vice versa, according to ''The law of conservation and transformation
of energy-mass'' and the entropy principle.
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Attached Images
L -cone.jpg (9.2 KB, 0 views )