Eternalism is the view that all times are equally real. The relativity of simultaneity in special relativity backs this up. There is no cosmically extended, self-existing 'now'. This leads to a tricky problem. What makes statements about the present true? I shall approach the problem along the lines of perspectival realism and argue that the choice of the perspective does. To corroborate this point, the Lorentz transformations of special relativity are compared to the structurally similar equations of the Doppler effect. The 'now' is perspectivally real in the same way as a particular electromagnetic spectrum frequency. I also argue that the ontology of time licensed by perspectival realism is more credible in this context than its current alternative, the fragmentalist interpretation of special relativity.

中文翻译：

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关于“现在”的永恒主义和透视现实主义

永恒主义认为所有时间都同样真实。狭义相对论中同时性的相对性支持了这一点。没有宇宙扩展的、自我存在的“现在”。这会导致一个棘手的问题。什么使关于现在的陈述为真？我将沿着透视现实主义的路线来处理这个问题，并认为透视的选择确实如此。为了证实这一点，狭义相对论的洛伦兹变换与多普勒效应的结构相似方程进行了比较。“现在”在透视上是真实的，就像特定的电磁频谱频率一样。我还认为，在这种情况下，透视现实主义许可的时间本体论比其当前的替代方案（狭义相对论的碎片化解释）更可信。