SIERRA COLLEGE OBSERVATIONAL ASTRONOMY

LABORATORY EXERCISE

NUMBER I.D. TITLE: Windows of Opportunity - Planispheres

DATE- PRINT NAME/S AND INITIAL BELOW: GROUP

DAY-

LOCATION

OBJECTIVE:

· To use a Planisphere and Seasonal Star Chart with the SC001 star map, enabling the prediction of celestial events for the purpose of planning a session of real sky observations.

· To compare the accuracy of the Planisphere (an analog computer) with a digital computer using “TheSKY” software program.

· To compare the Horizon Coordinates (Altitude and Azimuth) from a Seasonal Star Chart with values from “TheSKY”

· To make a finder chart utilizing “The SKY” software.

PROCEDURE:

· After explanation of the use of the planisphere, answer the questions below. For objects not identified on the planisphere, first locate them on the SC001 star chart. Then locate their approximate location on the planisphere using adjacent constellations and stars. Compare planisphere and “TheSKY” solutions for questions 1- 5.

· On the Seasonal Starchart handout, carefully plot the positions of five (5) celestial objects above the horizon tonight, in good viewing position at 8PM PST. Also plot the position of the moon and any planets that are above the horizon at 8 PM. Note the Sidereal time at 8PM tonight and write it in under the template.

· Complete table “A” by entering the Altitude and Azimuth from the Seasonal Star Chart and the altitude and azimuth from “TheSKY” program.

· Make a finder chart facing south at 8 PM using “TheSKY” software. Instructor will explain.

OBSERVATIONS/QUESTIONS: DATE FOR ALL CALCULATIONS =

1. What time will Aldebaran set?

Planisphere=

TheSKY =

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2. What time will Castor transit? Planisphere =

TheSKY =

3. What time will M13 Planisphere =

(found on SC001 in Hercules) set?

TheSKY =

4. What time will Spica rise? Planisphere =

TheSKY =

5. What time will the center of the Planisphere =

Square of Pegasus transit?

TheSKY =

TABLE ‘A’ 8PM Sidereal Time = ( )

DEEP SKY OBJECTS PLOTTED ON STAR CHART
OBJECT	Star Chart AZIMUTH	Star Chart ALTITUDE	TheSKY AZIMUTH	TheSKY ALTITUDE

· Also plot the location of any planet or the Moon on the Star Chart as observed at 8 PM (must be above horizon).

· Complete Bluebook Questions – Obtain Instructor Sign-off