How to see Earth’s shadow at sunrise and sunset

Atmospheric Planetary Shadow Phenomena

For skywatchers, sunrise and sunset offer more than just vibrant colors; they provide a chance to witness our planet's shadow cast onto the atmosphere. Under clear twilight conditions, Earth's atmospheric shadow can be observed directly with the naked eye.

Observational Techniques and Finding the Angle

To successfully spot this sky event, looking in the direction opposite to the Sun is essential. Facing the western horizon just before sunrise or the eastern horizon right after sunset reveals a distinct dark blue band hovering just above the horizon line.

Atmospheric Optics and Nature Watching

Observing Earth's shadow offers a tangible experience of our planet's spherical shape and how sunlight scatters through atmospheric layers. These simple observations under clear skies allow amateur astronomers and outdoor enthusiasts to experience atmospheric optics firsthand.