This page features an interactive Google map  showing the regional visibility of the Partial Solar Eclipse of 2018 Jul 13 . The Google map allows the user to zoom and scroll the map as desired. Clicking the cursor on any location will immediately generate a prediction of the eclipse circumstances from that location. The small global map to the right is for reference and illustrates the overall visibility of the eclipse (for an explanation of this map's features, see Key to Solar Eclipse Maps).
The interactive Google map below uses the Web Mercator projection to display the eclipse track. The large saddle-shapped region is the path of the Moon's penumbral shadow. This is the geographic region from which the partial eclipse can be seen. The northern and/or southern penumbral shadow path limits are plotted as green curves. The magenta loops represent the locus of all locations where the partial eclipse begins or ends at sunrise or sunset. Inside these regions the partial eclipse is in progress at sunrise or sunset. An orange curve also appears inside this region and represents the locus of all locations where the partial eclipse is at its maximum phase at sunrise or sunset. The Key to Google Eclipse Maps illustrates a map with each of these curves. You MUST be somewhere within the region enclosed by these curves in order to see the partial eclipse. Outside this region no eclipse is visible.
The green marker labeled GE is the point of Greatest Eclipse. For partial eclipses, the Sun is always on the horizon from this location. Although eclipses can be predicted with amazing accuracy, bad wather in the form of clouds can render them unobservable .
Google Maps uses a close variant of the Mercator projection, and therefore cannot accurately show areas around the poles. As a consequence, eclipse paths at high latitudes will appear highly distorted and may degrade into a series of straight line segments.
Map centered on (latitude, longitude):
Cursor position (latitude, longitude):
Distance from last marker:
Show marker on click
The zoom buttons (the 'plus' and 'minus' buttons to the lower right corner of map) are used to change the magnification . The user's cursor can be used for navigating around the map. Just hold the left mouse button down while the cursor is on the map, and drag the map around to reposition it. The two map buttons (top left) let you switch between map view and satellite view.
Click anywhere on the map to add a red marker. A popup window appears above the marker with the calculated eclipse times and magnitude for that location (see explanation of Eclipse Circumstances below). The 'x' in the upper right corner of the popup window closes the popup window. Additional markers can be placed anywhere on the map. Move the cursor over a marker to reveal a popup window with the eclipse times for that position. The predictions in the popup window can also be displayed in a new web page via the Eclipse Times Popup button (just below the map and to the right). You can select and copy this infomation to paste into a word processor.
All the markers can be removed by using the Clear Marker button (below the eclipse map). Choose the Large Map check box to produce a bigger map (hint: enlarge the browser window to its maximum size before selecting the Large Map check box). This option is especially useful to users with large monitors.
Below the lower left corner of the map are three readouts. The first gives the geographic coordinates (latitude & longitude) of the map center while the second gives the geographic coordinates of the cursor. The third line gives the distance of the cursor from the last marker. For more information, see Google Eclipse Map Instructions.
When you click on the map a red marker is added and a popup window opens giving the Eclipse Circumstances calculated for that location. The predictions in the popup window can be divided into two sections.
In the top part of the window, the decimal Latitude and Longitude of the marker are given. The Eclipse Magnitude is the fraction of the Sun's diameter eclipsed. The Eclipse Obscuration is the fraction of the Sun's area eclipsed.
The bottom part of the window consists of a table listing the times for important stages of the eclipse. The Event column lists eclipse phase, followed by the date and time (both in Universal Time). Finally, the Altitude and Azimuth of the Sun is given for each event. The altitude is measured from the horizon (0°) to the zenith (90°). The azimuth is measured from due North and rotating eastward (North = 0°, East = 90°, South = 180°, and West = 270°).
3. This web page approximates the curved eclipse path by using a series or To maintain the validity of this approximation, the maximum zoom level is limited to ~1 mile/inch (~0.7 kilometers/centimeter). This should prevent over-interpretation of the eclipse path accuracy. You can disable the zoom limit using the link to reload the map. ↩
Links for the Partial Solar Eclipse of 2018 Jul 13
- Prime Page: Partial Solar Eclipse of 2018 Jul 13
- Orthographic Map: Partial Solar Eclipse of 2018 Jul 13 - detailed map of eclipse visibility
- Animated Map: Partial Solar Eclipse of 2018 Jul 13 - animated map of the Moon's shadows across Earth
- Circumstances Table: Partial Solar Eclipse of 2018 Jul 13 - eclipse times for hundreds of cities
- Saros 117 Table - data for all eclipses in the Saros series
Links to Additional Solar Eclipse Predictions
- Home - home page of EclipseWise with predictions for both solar and lunar eclipses
- Solar Eclipses - primary page for solar eclipse predictions
- Solar Eclipse Links - detailed directory of links
- Six Millennium Catalog of Solar Eclipses - covers the years -2999 to +3000 (3000 BCE to 3000 CE)
- World Atlas of Solar Eclipse Maps - index page
- Thousand Year Canon of Solar Eclipses 1501 to 2500 - link to the publication
- MrEclipse.com - eclipse resources and tips on photography
- Solar Eclipses for Beginners - a primer on solar eclipse basics
- MrEclipse Photo Index - an index of solar eclipse photographs
Predictions for the Partial Solar Eclipse of 2018 Jul 13 were generated using the JPL DE406 solar and lunar ephemerides. The lunar coordinates were calculated with respect to the Moon's Center of Mass. Although the predictions are first calculated in Terrestrial Dynamical Time (TD), they are then converted to Universal Time (UT1) as presented here. The parameter ΔT is used to convert between the two times (i.e., UT1 = TD - ΔT). For this eclipse ΔT has a value of 68.9 seconds.
Some of the content on this website is based on the book Thousand Year Canon of Solar Eclipses 1501 to 2500. All eclipse calculations are by Fred Espenak, and he assumes full responsibility for their accuracy.
Permission is granted to reproduce the eclipse data when accompanied by a link to this page and an acknowledgment:
"Eclipse Predictions by Fred Espenak, EclipseWise.com"
The use of diagrams and maps is permitted provided that they are unaltered (except for re-sizing) and the embedded credit line is not removed or covered.
Please visit the Acknowledgments Page for additional information.