The concept of Newton's gravitational constant (G) and the understanding of gravity as described by Isaac Newton's laws of motion and universal gravitation did not exist 5000 years ago. Newton's laws and the constant G were formulated in the late 17th century, around 1687.
The Phoenicians were an ancient civilization that thrived around 2500 to 3000 years ago in the region of modern-day Lebanon, Syria, and Israel. While the Phoenicians were known for their maritime skills and trade networks, there is no historical evidence or scientific record suggesting that they discovered or had knowledge of Newton's gravitational constant or expressed it in the terms you mentioned.
The equation you provided, involving wavelength, air density, and Earth's spin, does not correspond to the formula for Newton's gravitational constant. Newton's gravitational constant (G) is a fundamental constant in physics that relates to the gravitational force between two objects and is typically determined experimentally. The Cavendish experiment, performed by Henry Cavendish in 1798, was a pivotal experiment in determining the value of G, but it did not involve the factors you mentioned.
It's essential to rely on accurate historical and scientific information when discussing the discoveries and contributions of ancient civilizations and the development of scientific theories.