The sun's ascent above Earth's horizon is observed from the International Space Station, marking the approaching peak of ...

This discovery marks the first known case of a compact planetary system with such a noticeable tilt between close planet ...

Since Kepler's laws of motion dictate that celestial bodies orbit more slowly when farther from the sun, we are now moving at ...

On Jan. 4, Earth received its maximum radiation from the sun, which was at its largest in the sky for 2025. The difference isn't huge — the sun today appears to be a mere arcminute (1/60th of a degree ...

Summer began 84 million years ago, when the earth’s axis tilted twelve degrees. Before that, there were no seasons. We don’t ...

I was looking forward to writing a tribute to clear summer skies and great summer stargazing in the Pacific Northwest.

Mars, for example, is tilted by about 25 degrees, similar to Earth. Its orbit is much more elliptical, however, and that dominates the analemma, making it more teardrop-shaped.

Saturn’s moon Titan has always stood out among the celestial bodies in our solar system. It is the only moon with a thick, ...

Due to Earth's tilted axis of approximately 23.5 degrees, the Northern Hemisphere receives sunlight at its most direct angle during the solstice, while the Southern Hemisphere enters winter ...

June 21, 2025, marks the summer solstice in the Northern Hemisphere, bringing the longest day and shortest night of the year.

Since the solstice occurs so late at night Philly time, is the longest day the 20th or the 21st? The answer: Both. The ...