Eclipse Calculator

How to Use the Eclipse Calculator

The Eclipse Calculator is designed to help determine important details about upcoming solar or lunar eclipses visible from a specific location. Follow this guide to efficiently use the calculator and get the information you need.

Step 1: Enter Observer’s Latitude

Begin by entering the observer’s latitude in the field labeled Observer’s Latitude (degrees). This value should range between -90 and 90 degrees. Use the placeholder as a guide for acceptable values, ensuring to enter a number that precisely represents the latitude of your observation point.

Step 2: Enter Observer’s Longitude

Next, input the observer’s longitude in the field labeled Observer’s Longitude (degrees). This should be a number between -180 and 180 degrees. Ensure that your input is accurate and falls within the specified range.

Step 3: Select the Eclipse Date

Select the date of the eclipse you wish to calculate details for. Use the date picker in the Eclipse Date field, ensuring the date is between January 1, 2024, and December 31, 2100.

Step 4: Choose Eclipse Type

From the dropdown menu labeled Eclipse Type, select either Solar Eclipse or Lunar Eclipse. This selection is required to proceed with the calculation.

Step 5: Enter Altitude Above Sea Level

Input the altitude above sea level at your observation location in the Altitude Above Sea Level (meters) field. This should be a value between 0 and 8848 meters. It is crucial to enter an accurate altitude to ensure precise calculations.

Interpreting the Results

After entering all required fields, the calculator will compute and display several results:

• First Contact (C1): Displays the date and time when the eclipse begins.
• Second Contact (C2): Indicates the time when total or annular eclipse starts.
• Maximum Eclipse: Shows the date and time of the peak of the eclipse.
• Third Contact (C3): Shows when the total or annular eclipse ends.
• Fourth Contact (C4): Indicates when the eclipse is completely over.
• Eclipse Magnitude: Reflects the magnitude of the eclipse as a decimal value.
• Eclipse Obscuration: Displays the obscuration of the eclipse as a percentage.
• Duration of Totality/Annularity: Provides the duration of total or annular eclipse in seconds.

Review each result to plan your observation of the eclipse accordingly. Ensure that your observation setup aligns with the calculated times and data provided by the calculator.