diff --git a/README.md b/README.md
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@@ -1623,6 +1623,7 @@ API | Description | Auth | HTTPS | CORS |
 | [arXiv](https://arxiv.org/help/api/user-manual) | Curated research-sharing platform: physics, mathematics, quantitative finance, and economics | No | Yes | Unknown |
 | [CodeCogs](https://editor.codecogs.com/docs/4-LaTeX_rendering.php) | Render LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats with styling options | No | Yes | Unknown |
 | [CORE](https://core.ac.uk/services#api) | Access the world's Open Access research papers | `apiKey` | Yes | Unknown |
+| [CycleCalcs](https://www.cyclecalcs.com/api.html) | Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons | No | Yes | Yes |
 | [GBIF](https://www.gbif.org/developer/summary) | Global Biodiversity Information Facility | No | Yes | Yes |
 | [iDigBio](https://github.com/idigbio/idigbio-search-api/wiki) | Access millions of museum specimens from organizations around the world | No | Yes | Unknown |
 | [inspirehep.net](https://github.com/inspirehep/rest-api-doc) | High Energy Physics info. system | No | Yes | Unknown |