An ephemeris is a table giving the predicted positions of an object in space, like another planet, comet, or asteroid.
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| Calendars | | Pre-Julian / Julian | |
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| Gregorian | |
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| Astronomical | |
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| Others | |
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| Astronomic time | |
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| Geologic time | | Concepts | |
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| Standards | |
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| Methods |
- Chronostratigraphy
- Geochronology
- Isotope geochemistry
- Law of superposition
- Luminescence dating
- Samarium–neodymium dating
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Chronological dating | | Absolute dating | |
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| Relative dating |
- Fluorine absorption
- Nitrogen dating
- Obsidian hydration
- Seriation
- Stratigraphy
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| Genetic methods | |
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| Linguistic methods | |
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| Related topics | |
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