 The planets of the solar system as depicted by a NASA computer illustration. Orbits and sizes are not shown to scale.Credit: NASA

The ancient number square sequence is in the same  perfect order. View the odd numbered squares as follows: Locate the one number in the center of the oddly numbered squares. Then look diagonally at two numbers as follows:   (1) Immediately above and to the right. (2) Immediately below and to the left.

• Here are the first two such diagonal numbers of the  3 x 3 Square of Saturn: 2 and 8.
• Next look at the 5 x 5 of Mars. We have the 8 and 18 in diagonal with the central 13.
• Next we have the 7 x 7 of Venus. We have the 18 and the 32 in diagonal with the center.  That completes the main defining numbers of the periodic chart however, let’s continue the sequence.
• Look at the 9 x 9 of the Moon. We have 32 and 50. Here is a special case. When we add 32 + 50 = 82. This is the highest atomic number of a non-radioactive element. It effectively completes the stable elemental series.

Why the planetary associations? This does not prove a lost ancient, advanced civilization that used number squares instead of our periodic chart.   But it makes the likelihood slightly greater than previously thought.