You can now read 5 articles in a month for free on Read as much as you want anywhere and anytime for just 99¢.

The Tip

Be ready for the green flash

Continue reading below

Conditions aboard a cruise ship can be almost ideal for seeing the elusive “green flash,” the ray of green light at the end of sunset. Some travelers search in vain their whole lives, although others who know where and how to look see the flash often. Here’s how to bolster your chances: You must be higher than the apparent horizon, which is why an ocean horizon is perfect but an island will block the green flash every time. It also helps to have clear air. A line of clouds at the horizon can make the flash hard to see unless the sun sets below them. Use binoculars or a telephoto lens since the flash is tiny and disappears fast. Finally, don’t stare at the setting sun. The red rays will bleach your retina and the “green” flash will look yellow. Wait until the sun is almost down to start watching.

Loading comments...
Want each day's news headlines delivered fresh to your
inbox every morning? Just connect with us
in one of the following ways:
Please enter a valid email will never post anything without asking.
Privacy Policy
Subscriber Log In

You have reached the limit of 5 free articles in a month

Stay informed with unlimited access to Boston’s trusted news source.

  • High-quality journalism from the region’s largest newsroom
  • Convenient access across all of your devices
  • Today’s Headlines daily newsletter
  • Subscriber-only access to exclusive offers, events, contests, eBooks, and more
  • Less than 25¢ a week
Marketing image of
Marketing image of