A reference point is the specific place or situation used to orient us in space or in time. Different to the reference points of the space, in the time reference points are flowing, changing.
Space:
- Cardinal Points
- Geographical coordinates
- The corner between two streets
- A house or a building
- A house wall or object in it
- Others
Time:
- Movements of the Earth
- Clocks and calendars
- Cycle of life, of pregnancy, a movie, a song, etc..
- Others
To orient us in the space we use our senses and to orient us in the time we use the chromnesia (temporal memory), the history and the intuition. With no participation of the observer (the senses, the intuition and the chromnesia) reference points would have no utility.
Zero is also a reference point in the numerical scale. It's used in the coordinate axes and measuring instruments.
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