Pascal Tordeux / A tree on horizon illuminated by a rays through clouds. Picardie, France.

PETER WARBURTON / Triangular J building, Monte Alban, the ancient centre of Zapotec culture, Oaxaca, Mexico. It is believed that the unusual angles were aligned with certain celestial events, making J building an earl...

Harley Betts / Star trails around the south celestial pole over Mt Taranaki, also known as Mt Egmont (8,261 feet) a dormant volcano in the southwest corner of the North Island near the Tasman Sea, Egmont National Pa...

Harley Betts / Star trails around the south celestial pole in the evening sky over the Pouakai Range, Egmont National Park, New Zealand

Harley Betts / Star trails around the south celestial pole in the evening sky over the Pouakai Range, Egmont National Park, New Zealand

Harley Betts / Star trails around the south celestial pole over Mt Taranaki, also known as Mt Egmont (8,261 feet) a dormant volcano in the southwest corner of the North Island near the Tasman Sea, Egmont National Pa...

Harley Betts / Star trails around the south celestial pole over Mt Taranaki, also known as Mt Egmont (8,261 feet) a dormant volcano in the southwest corner of the North Island near the Tasman Sea, Egmont National Pa...

Barry Bland / A man navigating by Sextant, a measuring instrument generally used to measure the angle of elevation of a celestial object above the horizon. Model Released. ^^^Making this measurement is known as sig...

Barry Bland / A man navigating by Sextant, a measuring instrument generally used to measure the angle of elevation of a ^^^celestial object above the horizon. Making this measurement is known as sighting the object...