• Fulvio says:

    Hi Dan,
    More or less I’m in agreement with your point. To me it seems that the Alpenglow is (indeed direct light but intertwined with the “nautical point of visibility” [ a nautical formula which connect height of you and height of the observed object]) I don’t have any particular formula on hand since I use to calculate approximately based on the size of my hand.

  • Dan says:

    Hi Fulvio. Your point seems correct as well. It’s all about perspective. What is considered indirect light for one person is direct light for someone else who has a different point of observation. If I’m hiding behind a tree and shining a flashlight on an object in front of you, you can still see the direct light, even if you can’t see the actual source.

  • Jen says:

    Nice article, even nicer pictures 🙂
    From my point of view it’s self-evident that the peaks of mountains are still in direct sunlight when for us in the valley /further down the sun has already set.
    Doesn’t just simple reasoning point to the rose color being the same reddish light we see at sunset?
    Anyway – enjoyed your article. Thank you, Dan.

  • Dan says:

    Hi Jen, thanks for your comment.

    Yes, it’s a simple matter of perspective. It’s the very same light, just observed from different vantage points. Imagine if I were standing behind a tree, shining a flashlight on the person in front of you. Even though you can’t see me or my flashlight, you can still see the direct light hitting your friend. You’d be surprised at how often “simple reasoning” isn’t taken into account with certain observations. Then again, maybe not!

    At any rate, I hope you get out and watch the wonderful rosy glows of sunset as often as you can!

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