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"Rainbow Season" is here, acorns drop as autumn color wraps up

Great viewing conditions for Leonid meteor shower tonight

Rainbow over the Children's Pool, La Jolla
Rainbow over the Children's Pool, La Jolla

“Rainbow Season” Arrives With The First Rains Of Late Fall. Scattered showers are best for rainbow watching: sunlight refracting and reflecting through the raindrops causes two bows to appear — an intense circular arc at 42˚ and a bigger but weaker arc at 51˚ from the antisolar point (the point in the sky diametrically opposed to the sun’s position). From November through mid-February, the sun never gets higher than 42˚ above the horizon as seen from San Diego, so (rain and sunlight permitting) the brighter of the two arcs may appear above the horizon at any time of day. In spring and summer, rainbows are never seen in the sky around midday because the sun is too high — and the antisolar point is too low.

Woodpeckers are stuffing acorns into pine trees.


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Acorn Dropping Reaches A Crescendo early this month in the Cuyamaca, Laguna, and Palomar Mountains. Wiry scrub oaks, massive canyon live oaks, and the golden-leaved black oaks all contribute to the growing collection of acorns littering the ground. Acorn woodpeckers are busy stuffing acorns into the small holes they drill into the bark of pine trees. Beneath the trees, the browns of bracken fern and the reds of poison oak are among the last expressions of autumn color we’ll see in the mountains this year.


The Annual Leonid Meteor Shower Peaks on November 17–18. This moderate meteor shower should average 10 to 15 meteors per hour. The sky will be quite dark as the moon will be a waxing descent and only 5% full and viewing conditions will improve drastically after midnight. If you are watching for shooting stars, look toward the part of the night sky furthest away from the Moon. All Leonid meteors appear to radiate from the constellation of Leo, which currently lies high in the south at dawn.

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Rainbow over the Children's Pool, La Jolla
Rainbow over the Children's Pool, La Jolla

“Rainbow Season” Arrives With The First Rains Of Late Fall. Scattered showers are best for rainbow watching: sunlight refracting and reflecting through the raindrops causes two bows to appear — an intense circular arc at 42˚ and a bigger but weaker arc at 51˚ from the antisolar point (the point in the sky diametrically opposed to the sun’s position). From November through mid-February, the sun never gets higher than 42˚ above the horizon as seen from San Diego, so (rain and sunlight permitting) the brighter of the two arcs may appear above the horizon at any time of day. In spring and summer, rainbows are never seen in the sky around midday because the sun is too high — and the antisolar point is too low.

Woodpeckers are stuffing acorns into pine trees.


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Acorn Dropping Reaches A Crescendo early this month in the Cuyamaca, Laguna, and Palomar Mountains. Wiry scrub oaks, massive canyon live oaks, and the golden-leaved black oaks all contribute to the growing collection of acorns littering the ground. Acorn woodpeckers are busy stuffing acorns into the small holes they drill into the bark of pine trees. Beneath the trees, the browns of bracken fern and the reds of poison oak are among the last expressions of autumn color we’ll see in the mountains this year.


The Annual Leonid Meteor Shower Peaks on November 17–18. This moderate meteor shower should average 10 to 15 meteors per hour. The sky will be quite dark as the moon will be a waxing descent and only 5% full and viewing conditions will improve drastically after midnight. If you are watching for shooting stars, look toward the part of the night sky furthest away from the Moon. All Leonid meteors appear to radiate from the constellation of Leo, which currently lies high in the south at dawn.

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