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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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Related Experiment Video

Updated: Jun 16, 2026

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
11:38

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Published on: February 27, 2017

Spectral changes in the zenith skylight during total solar eclipses.

W N Hall

    Applied Optics
    |January 30, 2010
    PubMed
    Summary

    Zenith sky spectral intensity remained constant during a 1970 solar eclipse. Color shifts observed at lower solar angles align with Rayleigh scattering, but higher angles show inconsistencies.

    Area of Science:

    • Atmospheric optics
    • Solar physics
    • Spectroscopy

    Background:

    • Understanding the spectral distribution of the zenith sky is crucial for atmospheric studies.
    • Total solar eclipses offer unique opportunities to study atmospheric light scattering.
    • Previous measurements have shown varying results regarding color shifts during eclipses.

    Purpose of the Study:

    • To measure the relative spectral intensity of the zenith sky during a total solar eclipse.
    • To investigate potential color shifts in the zenith sky spectrum during an eclipse.
    • To compare eclipse observations with established atmospheric scattering models.

    Main Methods:

    • Utilized an optical scanning spectrometer for spectral intensity measurements.
    • Recorded data at Nantucket Island, Massachusetts, during the March 7, 1970, total solar eclipse.

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  • Calculated spectral ratios I(5100 A)/I(4300 A) and I(5900 A)/I(5100 A).

    • Main Results:

    • Spectral ratios remained constant for up to 96% solar obscuration.
    • A blue color shift was observed for solar elevation angles below 45 degrees, consistent with Rayleigh scattering.
    • Inconsistent color shifts were noted for solar elevation angles above 45 degrees.

    Conclusions:

    • Zenith sky spectral intensity is stable during significant solar obscuration.
    • Rayleigh scattering explains observed color shifts at lower solar elevation angles.
    • Inconsistencies at higher solar angles may stem from challenges in selecting a reference spectrum.