Section 200.22 Program standards for behavioral interventions. Behavioral interventions for students with disabilities shall be provided in accordance with this section and those other applicable provisions of this Part and/or Part 201 that are not inconsistent with this section. (a) Assessment of student behaviors.
The age of Earth was calculated to be about 24-40 million years based on the laws of thermodynamics. Unknown at the time was that the Earth has an internal heat source (radioactive decay) In 1899, John Joly (Irish) calculated the rate of delivery of salt to the ocean.
But in fact, nobody knows, and in reality no answer will ever fully suffice. A day on Earth is determined by how long it takes the planet to spin once on its axis. That's pretty easy to measure, because Earth's surface is solid. Just sit there for about 24 hours, 3 minutes and 56.55 seconds, on average, and measure the time between two sunrises. (That works today, but eventually we will have more than 24 hours to get this job and others done. A lot more.