Lunar Cycle Calculator
The moon doesn’t follow a rigid schedule. It waxes and wanes, and then drifts some more across a timeline you intuitively understand yet struggle to … Read More
JSCalc
Days Until Full Moon Calculator
Maybe you’re trying to figure out when the next full moon arrives, perhaps you’re preparing to do some night photography, maybe you want to know … Read More
Lunar Age Calculator
Every night, the Moon look different; and it always does so according to a rigid pattern: From one new moon to the next take roughly … Read More
Moon Phase Calculator
Every night, the moon change shape. It changes from a bright disk to a dark void, and back again. For thousands of years, it’s been … Read More
Solar Energy Received Calculator
At some point, you probably read the spec sheet on a solar panel and saw a big number in watts. It could be a six … Read More
Solar Constant at Distance Calculator
“Light is so weak here, it’s not even like being on Earth,” he says, as he stands up on Mars. “The atmosphere is so thin … Read More
Solar Irradiance Calculator
On a sunny day, you may think: “oh, there’s plenty of energy falling on my roof.” But that’s not true. The sun doesn’t radiate equally … Read More
Solar Noon Calculator
Enter your date and location in the calculator above, and exact moment of solar noon for that day will be computed for you. No guessing … Read More
Equation of Time Calculator
It’s noon. You look at your garden sundial and it says 10 minutes early. Is your clock out of whack? No, the sun is. That’s … Read More
Solar Declination Calculator
On summer days, sun is high up in the sky. In winter, the sun are low in the sky. Why? This is because of the … Read More