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`"Time"_"[pt_1,pt_2]" = (f_"haversine"(( lat_2 - lat_1 ) and ( lon_2 - lon_1 ))) / "v" `

Enter a value for all fields

The **Haversine Travel Time** calculator computes the time to travel between to points on the globe in a great circle arc at an average velocity. * Great circle arc*

**INSTRUCTIONS:**Enter the following:

- (
**Lat**_{1}_{)}This is the latitude of the first point. - (
**Lon**) This is the longitude of the first point._{ 1} - (
**Lat**) This is the latitude of the second point._{ 2} - (
**Lon**) This the longitude of the second point._{ 2} - (
**v**) This is the average velocity traveled.

**Travel Time (t):** The **Haversine Travel Time** calculator returns the time required to travel between the points in minutes (m). However, this can be automatically converted to other time units (e.g. seconds, hours, days, months) via the pull-down menu.

- To compute the distance between two latitudes and longitudes,CLICK HERE.
- To compute decimal degree angles from degrees, minutes and seconds,CLICK HERE.

The Haversine Travel Time calculator uses the Haversine equation to compute the distance between two points (x and y) on the Earth. It then uses a mean velocity (speed) to calculate the time necessary to travel between the two points on the globe.

The time of travel is calculated by dividing the distance traveled by the average velocity. This formula allows the user to enter two points on the globe in latitude and longitude, and a speed. This formula uses the Haversine formula to approximate the distance between the two points. The Haversine formula is based on a spherical earth model employing the Earths mean radius.

This formula will provide a fairly accurate estimate on the amount of time it would take a tsunami to travel between two points. The velocity of a tsunami is reported to be 500 miles per hours when in deep water (See U.S. Gov Report).