The EarthDial Project • FCPS/NOVAC EarthDial Team

The EarthDial Project - FCPS/NOVAC EarthDial Team is comprised of four members: John Avellone, amateur telescope maker and member, Northern Virginia Astronomy Club (NOVAC); Lee Ann Hennig, Planetarium Teacher, Thomas Jefferson High School for Science and Technology (TJHSST); Gary Purinton, Planetarium Teacher, Falls Church High School; and Walter Sanford, Planetarium Teacher, Carl Sandburg Middle School. Credits: Mr. Avellone, Design & Construction Manager; Ms. Hennig, Site Manager; Mr. Purinton, Webcam32 Software Manager; and Mr. Sanford, Project Coordinator & Webmaster/Curator. Special thanks to Phillip Wherry, Technical Consultant. Web camera provided by Sandburg Middle School; Webcam32 software provided by Falls Church High School; Web hosting provided by "Sanford Instructional Technology."

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The FCPS/NOVAC EarthDial, constructed
by John Avellone (a work-in-progress).

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John Avellone (shown left) & Walter Sanford
(shown right) checking the time...

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...of Sun transit on Friday, 16 JAN 2004.

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Sun transit occured at ~12:18 p.m. EST.

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Setting the sundial by marking a true
north-south line...

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...on the TJHSST Planetarium observation

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Testing the video camera.

The FCPS/NOVAC EarthDial is a horizontal sundial with a vertical gnomon, designed to resemble the MarsDials located on-board NASA's twin Mars Exploration Rovers, Spirit and Opportunity. [Typically, horizontal sundials have a triangle-shaped gnomon.]

A Garmin GPS 40 was used to determine the exact location of the FCPS/NOVAC EarthDial. The sundial was set by using the time of Sun transit (12 noon Local Apparent Time) to align the sundial's meridian line (noon hour line) with a true geographic north-south line. To ensure proper alignment of the sundial, time checks were performed periodically on two different days.

The FCPS/NOVAC EarthDial Webcam is a generic composite video camera that is connected to a Hewlett-Packard Vectra PC equipped with an ATI All-in-Wonder video card. Webcam32 webcam software is used to capture live still-video images (every 10 minutes on the 10s) that are webcast on the ED-7 Webcam home page.

© Copyright 2004-2012 Walter Sanford. All rights reserved.

Photographs courtesy Lee Ann Hennig, Planetarium Teacher, TJHSST.
Thumbnail images prepared using photoweb v3.0
by Phil Wherry & Eric Johnston.

Photo Index II... | FCPS/NOVAC EarthDial Webcam | The EarthDial Project