Browse Prior Art Database

Efficient Printing of Local Sunrise Times

IP.com Disclosure Number: IPCOM000121947D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 4 page(s) / 116K

Publishing Venue

IBM

Related People

Vincent, JP: AUTHOR

Abstract

A method is given for efficiently printing local sunrise time on a computer-printed calendar.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 66% of the total text.

Efficient Printing of Local Sunrise Times

      A method is given for efficiently printing local sunrise
time on a computer-printed calendar.

      Consider a computer calendar system where a user can request
that a calendar be printed in a variety of formats. Current
commercial calendars sometimes contain local astronomical information
such as the exact time of phases of the moon and eclipses. It is
impractical to print the local sunrise time in a commercial calendar
as this time varies from location to location within the range of
commercial sales.  Since sunrise times vary about four minutes for
every degree of longitude, a commercially printed calendar would be
able to print only a general, and therefore imprecise, sunrise time.
Computer calendars can, however, be personalized and thus can include
a precise sunrise time.  The calculation of sunrise requires a good
deal of computer time. It is not a practical solution to calculate
the time of sunrise each time a user wishes to print a calendar. The
proposed solution provides a way to calculate and store the times of
sunrise for a user's location one time, and then use the stored times
for each printed calendar.

      Refer to Fig. 1 This shows a typical computer terminal screen
where a user can specify the information necessary to calculate
sunrise, longitude, latitude, city name, time zone, and the name of
the file where the times of sunrise will be stored. When the user
presses the "calculate" key, the...