| Non observable (contains GMm or ) | ||
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| 1873 modified Newton and forward: | “Original” Newton: |
| Gravity force |
| when |
| Mass must be |
| (collision time, see [21] ) |
| Gravitational constant |
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| Observable predictions, identical for the two methods: (contains only GM) | ||
| Gravity acceleration |
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| Orbital velocity |
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| Orbital time |
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| Velocity ball Newton cradle |
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| Periodicity Pendulum (clock) |
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| Frequency Newton spring |
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| Gravitational red-shift |
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| Observable predictions (from GR): (contains only GM or only ) | ||
| Time dilation |
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| Gravitational deflection (GR) |
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| Advance of perihelion |
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| Quantum analysis: |
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| Constants needed | G, , and c or , , and c | and indirectly c, but |
| Variable needed | one for mass size | one for mass size |