1.0
DCPLUS
20220902
23520300
20250730
23520300
https://www.arcgis.com/sharing/rest/content/items/59403010eeff4d1bb838ca58d4dcb16c/info/thumbnail/thumbnail1662162796037.png
https://www.arcgis.com/home/item.html?id=59403010eeff4d1bb838ca58d4dcb16c
59403010eeff4d1bb838ca58d4dcb16c
Feature Service
https://services9.arcgis.com/RHVPKKiFTONKtxq3/arcgis/rest/services/Day_Night_Terminator/FeatureServer
Day/Night Terminator
2022-09-02T23:52:03
2025-07-30T15:31:00
Terminator
esri_environment
Live Feeds
Day Night Terminator
Layer item that maintains Global Daytime, Nighttime, and Twilight coverage (Solar Terminator) as well as the Horizon and the Sun's position as the Earth orbits the Sun. This data is generated by Esri using a planetary time-based algorithm (math).
<div>A layer item maintained by a Live Feed routine that regularly computes the approximate location of the Sun, perpendicular to the planet, using the current UTC date and time. Watch as the Sun, Day/Night Terminator, and Horizon pass over your map, highlighting what areas are in dusk, darkness, and dawn. Terminator Polygons include a <a target='_blank' href='https://developers.arcgis.com/rest/geoenrichment/api-reference/enrich.htm' rel='nofollow ugc noopener noreferrer'><strong>GeoEnriched</strong></a> attribute containing the approximate Total Population experiencing twilight or darkness.</div><div> </div><div>Originally inspired by <a target='_blank' href='https://www.arcgis.com/home/item.html?id=6c65b0f17ffc4bfdb71f60ca64d40bcc' rel='nofollow ugc noopener noreferrer'><strong>Jim Blaney's JSAPI item</strong></a>, the data is maintained by a modified Python routine adapted from John Gravois' GitHub JSAPI "<a target='_blank' href='https://github.com/jgravois/midnight-commander' rel='nofollow ugc noopener noreferrer'><strong>midnight-commander</strong></a>" project. Small corrections and enhancements provide the Sub-Solar Point (Sun's location on the planet), the Horizon line (mid-line of the Sun that meets the horizon), and the Twilight features showing dusk and dawn as the Sun reflects light in the atmosphere.</div><div> </div><div><a target='_blank' href='https://en.wikipedia.org/wiki/Twilight' rel='nofollow ugc noopener noreferrer'><strong>Twilight</strong></a>, also known as Dawn and Dusk, is the visible reflective light in the atmosphere as the Sun dips below (Dusk) or approaches (Dawn) the Horizon. Three stages of Twilight are classified at 6 degree increments, producing various shades of darkness and vibrant colors.</div><div><ul><li><i><strong>Civil Twilight</strong></i> is the first stage as the Sun moves below the Horizon (Dusk) or the last as the Sun approaches the Horizon (Dawn). Enough natural light exists for people to see without needing artificial light. Celestial objects are not yet visible.<br /> </li><li><i><strong>Nautical Twilight</strong></i> is the second stage. Artificial light is now helpful and Celestial objects can be seen with ease. Ships find it difficult to navigate by the Horizon.<br /> </li><li><i><strong>Astronomical Twilight </strong></i>is the last stage before darkness sets in. Only distant clouds are a glow on the Horizon with bright stars in full view.</li></ul></div><div> </div><div><span style='font-size:medium;'><strong>What can I do with this layer?</strong></span></div><div><ul><li>A continually updated visual representation of this daily cycle provides an additional source of information for planners and decision makers that operate in an environment that is impacted by the day/night cycle. This may include logistics and fleet management, maritime, law enforcement, as well as other first responders who are engaged in search and rescue operations where daylight is critical to mission execution.</li><li>Example item using Terminator to blend the <a target='_blank' href='https://www.arcgis.com/home/item.html?id=d7f7f8d1b5ef45f586a8ae7e33e508c7' rel='nofollow ugc noopener noreferrer'><strong>Earth at Night</strong></a> tile image.</li></ul><p> </p><p><span style='font-size:medium;'><strong>Source:</strong></span></p></div><div><ul><li>Calculation for the <a target='_blank' href='https://en.wikipedia.org/wiki/Position_of_the_Sun' rel='nofollow ugc noopener noreferrer'><strong>Position of the Sun</strong></a> (declination angle of the Sun)</li><li>Alternate calculation for <a target='_blank' href='https://en.wikipedia.org/wiki/Equation_of_time' rel='nofollow ugc noopener noreferrer'><strong>Equation of time</strong></a> (used to compute Sun's position)</li><li>Reference details for <a target='_blank' href='https://en.wikipedia.org/wiki/Twilight' rel='nofollow ugc noopener noreferrer'><strong>Twilight</strong></a></li></ul><div> </div><div><strong>Update Frequency:</strong> Every 10 minutes (at 5, 15, 25, ...) using the <a target='_blank' href='https://www.esriurl.com/LiveFeed' rel='nofollow ugc noopener noreferrer'><strong>Aggregated Live Feed Methodology</strong></a></div><div> </div><div><strong>Area Covered:</strong> The world</div><div> </div><div><div><strong>Coordinate System</strong>: GCS_WGS_1984, wkid: 4326, with Latitude limited to ±87.5 degrees for maximum compatibility.<br /> </div><p><strong>Layers:</strong></p></div><div><ul><li><i>Celestial Bodies</i>: Point layer containing current location of the Sun as it passes directly overhead, perpendicular to the planet.</li><li><i>Horizon</i>: Polyline layer containing the mid-line of the Sun as it sets on the horizon.</li><li><i>Terminator</i>: Polygon layer containing the 6 degree transitions from sunlight to civil, nautical, and astronomical <a target='_blank' href='https://en.wikipedia.org/wiki/Twilight' rel='nofollow ugc noopener noreferrer'><strong>Twilight</strong></a> (dawn and dusk) plus areas experiencing the dark of night. Also includes output from ArcGIS Online <a target='_blank' href='https://developers.arcgis.com/rest/geoenrichment/api-reference/enrich.htm' rel='nofollow ugc noopener noreferrer'><strong>GeoEnrichment</strong></a> attribute field "<i><strong>KeyGlobalFacts.TOTPOP</strong></i>" containing the approximate Total Population covered by each Polygon.</li></ul><div> </div><div><strong>Sample</strong>: See <a target='_blank' href='https://livingatlasoftheworld.s3.amazonaws.com/Resources/DayNightTerminator_ByDayForYear.mp4' rel='nofollow ugc noopener noreferrer'><strong>animation of data</strong></a> mapped at midnight each day for one year.</div><div> </div><div><span style='font-size:24px;'>Revisions</span></div><ul><li><div><strong>February 18, 2026</strong>: Update to Layer Popups to enhance presentation of information.</div></li><li><div><strong>July 30, 2025</strong>: Reduced Cache Control to 2 minutes down from 5 minutes. More frequent delivery for Map Layer refresh!</div></li></ul><div><p> </p><p><span style='color:#696969;'><i>This layer is provided for informational purposes and is not monitored 24/7 for accuracy and currency.</i></span></p><p>If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our <a target='_blank' href='https://livingatlas.arcgis.com/livefeeds-status/' rel='nofollow ugc noopener noreferrer'><strong>Live Feed Status</strong></a> Page!</p></div></div></div>
Esri
<img src='https://downloads.esri.com/blogs/arcgisonline/esrilogo_new.png' /> This work is licensed under the Esri Master License Agreement.<br /><div><a href='https://goto.arcgis.com/termsofuse/viewsummary' target='_blank' rel='nofollow ugc noopener noreferrer'><b>View Summary</b></a> | <a href='https://goto.arcgis.com/termsofuse/viewtermsofuse' target='_blank' rel='nofollow ugc noopener noreferrer'><b>View Terms of Use</b></a></div>
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165.0724973560001
87.50000000000007
-87.49999999999993
1
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
59403010eeff4d1bb838ca58d4dcb16c
https://services9.arcgis.com/RHVPKKiFTONKtxq3/arcgis/rest/services/Day_Night_Terminator/FeatureServer
Feature Service
EPSG