Solar Eclipse Finder

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Why We Love It

The Solar Eclipse Finder map underscores why people are enthralled by these rare, fleeting celestial events. This map is your guide to one of nature’s most spectacular shows, detailing eclipse duration and the path of the moon's shadow. A quick demo shows how to use the map. A binary colour scheme (green for past and orange for future) simplifies the experience and makes a legend unnecessary. We love how you can click a location to reveal any of the 905 solar eclipses between the years 1601 to 2200.

Why It Works

Here is a great example of the notion that sometimes “the map is the interface.” Within the Solar Eclipse Finder map, details emerge as you explore each location and each solar eclipse path. Rather than plot the paths as solid blocks, the map author uses gradient effects and line tapering. The map works because it gives an accurate portrayal of events and provides an evocative experience. Going beyond standard techniques, the map’s gradient effects capture the graceful and sweeping nature of an eclipse.

Important Steps

Choose the appropriate app template to showcase your work, or quickly create a custom one using AppStudio for ArcGIS. Embedding the map inside an app provides added control and polish to the user experience.

This application uses Bootstrap’s popover tooltips in the fly-out attribute window and its modal dialogue during start up.

The tapered symbol used by eclipse shadow paths is achieved with a linear gradient fill, supported by SVG—the underlying technology used for rendering vectors in Esri’s ArcGIS API for JavaScript.

To give emphasis to the eclipse paths, use a muted basemap, or style your own using vector tiles in ArcGIS Pro.

Requirements

Data

The eclipse paths were prepared by Michael Zeiler from data courtesy of Xavier Jubier. The basemap is Esri's Light Gray Canvas.

Analysis

With the analysis of the 905 paths pre-calculated for the years 1601 to 2200, the map simply plotted the source data as an ArcGIS Online hosted service. No additional analysis was needed.

Time

Development time was minimal, about two days, since the data was ready to plot. Most of this time was spent pushing the capabilities of HTML5/JavaScript to support advanced styling.

Solar Eclipses

Tips

This app shows both annular and total solar eclipses. While the concepts are simple, the terminology might not be familiar. The use of photos to explain these concepts is brilliant.

No UI

Tips

This map needs almost no UI since you can just click to see the information you want, and hover over the UI elements to go deeper.

Concise Explanations

Tips

Showing concise explanations via tooltips helps readers learn and explore at their own pace.

More Information

Map Author

Richie Carmichael

Richie Carmichael

@KiwiRichie | LinkedIn

A 13-year veteran at Esri and the Applications Prototype Lab. Trained as a New Zealand land surveyor. Striving for world peace one map at a time.

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