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    "text": "I wrote a blog post on how quaternions can be used to derive the equations of spherical geometry, as well as the sunrise equation relating the time of sunrise or sunset to one's latitude and the declination of the Sun. terrytao.wordpress.com/2024/12/19/q...",
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        "title": "Quaternions and spherical trigonometry",
        "description": "Hamilton’s quaternion number system $latex {\\mathbb{H}}&fg=000000$ is a non-commutative extension of the complex numbers, consisting of numbers of the form $latex {t + xi + yj + zk}&f…"
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    "createdAt": "2024-12-19T17:38:52.310Z"
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