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so Newton said that gravity was like or equivalent to a force?

When I learnt about SR we were talking about the passing of time as defined by a photon bouncing between two parallel mirrors. So when we're sitting our two parallel mirrors in a gravitational field, even though I suppose mathematically the experience of sitting in the field is like accelerating, the mirrors aren't actually moving. So why does the photon bouncing around in them see time change? If the mirrors aren't actually moving?

Thanks