HP HP-67 - Page 24

20 Meet the HP-67
Reading across the line, you can see that after you input the first
date (DT),), you are directed under the Keys heading to press .
Press Display
Julian day number
(number of days since the
inception of the Julian
calendar).
Now follow the instructions for the second date (DT,) which is
November 21, 1975.
Press Display
11.211975 11.211975
2442738. (Julian day number used
by astronomers.)
Now you move to step 4, which gives the key you press for cal-
culation. You can see that to calculate the days between dates, you
press .
Press Display
— 11401.
The number of days between September 3, 1944 and November 21,
1975 is 11401.
You can run the program again as often as you like. With the calendar
program, you can calculate the days between dates, the weeks
between dates, or even the day of the week on which any date falls.
You have seen from this example how simple it is to use your HP-67.
You can begin using your Standard Pac, or any of the optional
applications pacs, right now. All you have to do to begin taking
advantage of the calculating power and programmability of the HP-67
is follow simple instructions like these.