A rod was a dozen cubits, and a Sumerian cubit was about 20 inches. Supposedly it was one twenty-fifth of a "sacred cubit", 1.00106 imperial inches, or 2.5426924 centimetres. God could even confine God's Shechinah within one square cubit. The ancient Egyptian royal cubit () is the earliest attested standard measure. The Egyptian Royal Cubit is estimated at 525mm. The measurement according to celestial time, which celestial time signifies one day to a cubit. Cubit rods were used for the measurement of length. Another measure was the "cubit" (from "cubital"). The hekat was of a cubic cubit (approximately ). Rabbi Avraham Chaim Naeh put the linear measurement of a cubit at . In ancient times, a span was considered to be half a cubit. Avrohom Yeshaya Karelitz (the "Chazon Ish"), dissenting, put the length of a cubit at . Without exact knowledge of the size of a cubit, the altar could not be built. "Poffertjes" are thought to be related to and to have influenced the Indonesian "kue cubit". At some point, lengths were standardized by cubit rods.