A few feet to the west of the monument, an additional granite ledger has been set level with the ground. This tablet identifies the structure and the languages used on it, lists various facts about the size, weight and astronomical features of the stones, the date it was installed and the sponsors of the project. It also speaks of a time capsule buried under the tablet, but fields on the stone reserved for filling in the dates on which the capsule was buried and is to be opened have not been inscribed, so it is uncertain if the time capsule was ever put in place. Each side of the tablet is perpendicular to one of the cardinal directions, and is inscribed so that the northern edge is the top of the inscription. At the center of each tablet edge is a small circle, each containing a letter representing the appropriate compass direction (N, S, E, W).

The complete text of the explanatory tablet is detailed below. The tablet is somewhat inconsistent with respect to punctuation and also misspells "pseudonym". The original spelling, punctuation and line breaks in the text have been preserved in the transcription which follows (letter case is not). At the top center of the tablet is written:

The Georgia Guidestones
Center cluster erected March 22, 1980

Immediately below this is the outline of a square, inside which is written:

Let these be guidestones to an Age of Reason

Around the edges of the square are written the names of four ancient languages, one per edge. Starting from the top and proceeding clockwise, they are: Babylonian (in cuneiform script), Classical Greek, Sanskrit, and Ancient Egyptian (in hieroglyphics).

On the left side of the tablet is the following column of text:

Astronomic Features
1. channel through stone
indicates celestial pole.
2. horizontal slot indicates
annual travel of sun.
3. sunbeam through capstone
marks noontime throughout
the year

Author: R.C. Christian
(a pseudonyn) [sic]

Sponsors: A small group
of Americans who seek
the Age of Reason

Time Capsule
Placed six feet below this spot
On
To Be Opened on

The words appear as shown under the time capsule heading; no dates are engraved.

Physical data

1. OVERALL HEIGHT - 19 FEET 3 INCHES [5.87 m].
2. TOTAL WEIGHT - 237,746 POUNDS [107,840 kg].
3. FOUR MAJOR STONES ARE 16 FEET,
  FOUR INCHES [4.98 m] HIGH, EACH WEIGHING
  AN AVERAGE OF 42,437 POUNDS [19,249 kg].
4. CENTER STONE IS 16 FEET, FOUR-
  INCHES [4.98 m] HIGH, WEIGHS 20,957
  POUNDS [9,506 kg].
5. CAPSTONE IS 9-FEET, 8-INCHES [2.95 m]
  LONG, 6-FEET, 6-INCHES [1.98 m] WIDE;
  1-FOOT, 7-INCHES [0.48 m] THICK. WEIGHS
  24,832 POUNDS [11,264 kg].
6. SUPPORT STONES (BASES) 7-FEET,
  4 INCHES [2.24 m] LONG 2-FEET [0.61 m] WIDE.
  1 FOOT, 4-INCHES [0.41 m] THICK, EACH
  WEIGHING AN AVERAGE OF 4,875
  POUNDS [2,211 kg].
7. SUPPORT STONE (BASE) 4-FEET,
  2½ INCHES [1.28 m] LONG, 2-FEET, 2-INCHES [0.66 m]
  WIDE, 1-FOOT, 7-INCHES [0.48 m] THICK.
  WEIGHT 2,707 POUNDS [1,228 kg].
8. 951 CUBIC FEET [26.9 m³] GRANITE.
9. GRANITE QUARRIED FROM PYRAMID
  QUARRIES LOCATED 3 MILES [5 km] WEST
  OF ELBERTON, GEORGIA.

Guidestone languages
Below the two columns of text is written the caption "GUIDESTONE LANGUAGES", with a diagram of the granite slab layout beneath it. The names of eight modern languages are inscribed along the long edges of the projecting rectangles, one per edge. Starting from due north and moving clockwise around so that the upper edge of the northeast rectangle is listed first, they are English, Spanish, Swahili, Hindi, Hebrew, Arabic, Chinese, and Russian. At the bottom center of the tablet is the following text:

Additional information available at Elberton Granite Museum & Exhibit
College Avenue
Elberton, Georgia