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Blood Moon Lunar Eclipse Specta

We watched and captured images and spectra of the eclipse. Yes, green and blue light do get filtered out, or scattered traveling through Earth's atmosphere,  giving the Moon the blood red color seen during the eclipse last night.

A Star 100 Analyzer diffraction grating placed ahead of a camera lens creates the rainbow presentation of the colors, or wavelengths of light present in an object. In this case, the spectra are of the Moon during and after the eclipse. Each image shows a "spectrum", while more than one spectrum are referred to as "spectra."

Spectra captured during totality and after the lunar eclipse verifies
the reasoning which is offered to explain why the Blood Moon appears so
red during totality. The stated reasoning is the light illuminating the
moon during totality first travels through the Earths atmosphere, which
bends the lights trajectory around the Earth, allowing the light to
reach the surface of the moon. This trip through Earths atmosphere also
selectively scatters blue and green light wavelengths, leaving mostly
red light to illuminate the moon. The spectrum taken during totality
clearly shows the light is dominated by red light, when compared to the
spectrum from the fully illuminated moon containing a full range of red,
green and blue light wavelengths.

Adding a diffraction grating to the cameras light path allows one to acquire the spectra needed to see this effect.

Details: Canon 300D DSLR, ISO 800, focal length 200mm @f/5.6. Post
eclipse exposure - 1/400s. Totality exposure - 10s through Star Analyzer
100 lines/mm diffraction grating.

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  • Posted By: tking2097
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Photo Properties

  • Model: Canon EOS DIGITAL REBEL
  • Date/Time: 09-28-2015 11:58 AM
  • Exposure Time: 1/400 sec
  • Flash: 0
  • Focal Length: 200.0 mm

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