{
    "id": 5199,
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    "page_type": "Visualization",
    "title": "Moon Essentials: Libration in Latitude",
    "description": "A 2-frame GIF showing the extremes of lunar libration in latitude. || liblat.gif (1080x1080) [1.1 MB] ||",
    "release_date": "2024-06-24T16:10:00-04:00",
    "update_date": "2023-12-04T11:42:09.025303-05:00",
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                "name": "Ernie Wright",
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            "description": "A 2-frame GIF showing the extremes of lunar libration in latitude.",
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            "description": "Libration in latitude is an apparent north-south, up and down rotation of the Moon, as if the Moon were slowly nodding its head \"yes.\" This motion slightly changes the Moon's face as seen from Earth, revealing parts of the north and south poles. This repeats in a cycle lasting about 27.12 days, the average time it takes the Moon to complete an orbit relative to one of its [orbital nodes](/5326) (the *draconic* month).\r\n\r\nThe visualization on this page shows how libration in latitude is mostly an effect of the tilt of the Moon's orbit relative to its equator. The angle between these two planes is 6.68°. In the first half of the animation, the Moon's orbit is tilted while its equator is nearly horizontal, supporting the notion that we are slightly above or below the Moon. But this is a matter of perspective. In the second half of the animation, the orbit is horizontal while the Moon's equator is tilted, giving the impression that the Moon's orientation and not our relative position is responsible for the polar reveals.\r\n\r\nLibration in latitude is defined by an angle, the latitude component of the *sub-Earth point*. This is the lunar latitude at which the Earth is directly overhead, or the latitude line passing through the center of the Moon's disk as seen from Earth. This point is marked with a blue dot on the lunar globe in the lower half of the animation.",
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    "related": [
        {
            "id": 5326,
            "url": "https://svs.gsfc.nasa.gov/5326/",
            "page_type": "Visualization",
            "title": "Moon Essentials: Orbit",
            "description": "The mean (average) orbit of the Moon as it changes over the course of 8.5 years. Shows the tilt of the orbit and the slow rotation of the nodes (where the Moon's orbit intersects the orbit plane of the Earth) and the apses (the near and far points). This is a simplified model that ignores the short-term influence of the Sun and the rest of the solar system. || simple.1351_print.jpg (1024x576) [62.0 KB] || simple.1351_searchweb.png (320x180) [39.1 KB] || simple.1351_thm.png (80x40) [3.0 KB] || simple [0 Item(s)] || moon_orbit_simple_1080p30.mp4 (1920x1080) [9.1 MB] || moon_orbit_simple_720p30.mp4 (1280x720) [5.0 MB] || moon_orbit_simple_360p30.mp4 (640x360) [2.3 MB] || ",
            "release_date": "2024-07-18T12:00:00-04:00",
            "update_date": "2024-07-13T16:26:18.311799-04:00",
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                "media_type": "Image",
                "alt_text": "The mean (average) orbit of the Moon as it changes over the course of 8.5 years. Shows the tilt of the orbit and the slow rotation of the nodes (where the Moon's orbit intersects the orbit plane of the Earth) and the apses (the near and far points). This is a simplified model that ignores the short-term influence of the Sun and the rest of the solar system.",
                "width": 1024,
                "height": 576,
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        {
            "id": 5195,
            "url": "https://svs.gsfc.nasa.gov/5195/",
            "page_type": "Visualization",
            "title": "Moon Essentials: Libration in Longitude",
            "description": "A 2-frame GIF showing the extremes of lunar libration in longitude. || liblon.gif (1080x1080) [1.1 MB] || ",
            "release_date": "2024-06-24T16:00:00-04:00",
            "update_date": "2023-12-01T15:34:59.073328-05:00",
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                "alt_text": "Libration in longitude shown in three parts: the full lunar orbit, a close-up centered on the Moon, and a Moon globe with subsolar and sub-Earth points.",
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                "height": 576,
                "pixels": 589824
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