The first step in measuring the distance between the Earth and the Sun is to measure the distance between Earth and another planet in terms of the distance between Earth and the Sun. So, let us assume that the distance between Earth and the Sun is a.Now, let us consider the orbit of Venus.To first approximation, the orbits of Earth and Venus are perfect circles around the Sun. Take a look at the diagram below (not to scale).nyway, the relevant numbers are: Earth-Sun distance, d = roughly 150 million km (defined as 1 Astronomical Unit). Radius of the Sun, R sun = roughly 700,000 km. Orbital speed of Earth, v = roughly 30 km/s. References: 1  Great Moments in the History of Solar Physics 1.
Marijuana Lighting, Marijuana Grow Lights and Lamps. To grow the indoor marijuana plants is to learn the right types of lighting systems. There are three types of systems of lighting that are excellent ones for the cannabis plants, these are: the incandescent, fluorescent, and the high intensity discharge.
Cannabis Grow Lights and the Effect of Color Spectrum on Growing. First things first, don't worry too much about the color spectrum of your marijuana grow lights until you already have a pretty good handle on how growing works!You'll learn exactly how the color spectrum of your grow lights affect your plants in this article, but remember, color spectrum won't make or break your grow.ote: I've used all types of grow lights during all stages of growing marijuana, and even when you're not using the right color spectrum, you will still produce potent buds with pretty much any strong grow light!