uhifa_mountain.jpg
(12058 bytes)

Astrolabe Assembly Instructions

Return to Astrolabe Page

Return to Hands-on Activities Page

Return to Resources

Return to Main TOPS

Materials Required

  • Astrolabe master sheets
  • RA and Dec grid xeroxed onto heavy paper
  • Bright objects from Norton's Catalog
  • Elevation guide - xerox onto heavy paper
  • Overlay - xerox onto a transparency
  • manila file folder
  • glue stick and transparent tape
  • scissors
  • watersuluble transparency pens
  • self-adhesive plastic transparent book cover (optional)

Step-by-Step Instructions

Preparation
  • Cut out Elevation guide along the square.
  • Trace the elevation guide square on the manila folder, and cut out 2 squares of the same size (one can be in 2 halves if there is not enough space on the folder).
  • Cut out the RA / Dec grid (this one has stars) along the circle. Trace the circle onto the manila folder and cut out a manila circle.
  • Cut the transparency overlay diagonally at the corners, following guiding lines, and ONLY along 1 side P the one which says "cut this side only".
Assembly
  • Glue the two RA/Dec circle onto the manila circle. I will either make 2 circles and paste one on each side (so if you drop it in the dark you don't have to worry about orientation), or I may customize one side to include moving objects I intend to observe or my favorites list.
  • Crease the transparency along fold lines. Put glue on the reverse side of the transparency on all parts outside the square. Place the manila square on the outline of the square on the transparency, and fold over the excess transparency on side 1 and glue it down. Repeat the process for sides 2 and 3. Note: The transparency may be a little hard to fold, and you may need to weight it down with books until the glue dries.
  • Glue the second manila square on the back of the first manila square to hide the folded edges of the transparency. Put glue on the back side (blank) of the elevation square and glue it to the manila square. This should be oriented so when held the circle cannot fall out of its pocket.
  • Insert the circles into the pocket on the front side and the astrolabe is ready to use!
  • If you have the positions, RA and Dec of objects which change position (e.g. bright comets, planets etc.) which you wish to plot on the astrolabe, you would need to first laminate both sides of the RA/Dec circle (clear plastic book cover material works well). Then you can plot your object on the RA/Dec circle. Be sure to use water soluble marker pens so you can wipe them off later as objects move.
  • Tip: For greater durability you may want to laminate your circle with transparent book covers.


Last Updated on April 18, 2000

This page has been visited times since October 1999.
Karen Meech, Institute for Astronomy, University of Hawaii
meech@.ifa.hawaii.edu