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Poinsettia's scarlet bracts pop out, palm trees' fruit ripens

Jupiter and Saturn closest in our lifetimes

Premier Red pointsettia. 14-hour-long nights triggers their behavior.
Premier Red pointsettia. 14-hour-long nights triggers their behavior.

Poinsettias, a favorite of backyard gardeners, are now exhibiting their scarlet, petal-like bracts, just in time for the holidays. The onset of 14-hour-long nights triggers their behavior: In San Diego this condition is met just before the date of winter solstice — Monday, December 21.

A walk along the Discovery Center’s bayside illustrates the effect high and low tides have on coastal marshlands.

Exceptionally High and Low Tides are set to occur on several days in mid-December. These tides approximately coincide with the winter solstice — two factors that influence tide-level extremities. On Sunday, December 13, a peak high tide of +7.5 feet occurs at 7:37 a.m. Monday’s high tide of +7.62 peaks at 8:18 a.m. Tuesday’s high tide of +7.51 feet peaks at 9:00 a.m. Wednesday’s high tide of +7.18 feet crests at 9:42 a.m. There are at least two consequences of such high tides. If any strong winter storm happens to arrive from the west during these peak tides, some flooding of low-lying coastal areas around San Diego is likely. On the brighter side, birdwatchers have an opportunity to spot species of rare shorebirds that get pushed to the edges of local bays and coastal marshes by the high water. Several exceptionally low tides will also occur within the same string of mid-December dates. On Sunday, December 13, the tide falls to -1.71 feet at 2:42 p.m. On Monday, the tide drops to -1.89 feet (almost as low as it can possibly go) at 3:28 p.m. On Tuesday, a low tide level of -1.81 feet occurs at 4:14 p.m. On Wednesday, the tides drops to -1.51 feet at 5:00 p.m. (very near the time of sunset). Any of these lowtide occasions are perfect for exploring marine life in the tidepool areas along San Diego County’s coastline.

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Washington palm fruit

Ripening Palm Fruit, hanging in great clusters on California’s native fan palms (Washingtonia filifera), can be seen (and tasted) this month. The black, pea-sized fruit consists of a deliciously sweet but almost paper-thin skin surrounding a hard seed. (These are not “California dates” — the fruit of cultivated palms introduced into California’s deserts from northern Africa.) Our native fan palms can be seen in their natural habitat in about two dozen canyons within Anza-Borrego Desert State Park. They have also been planted widely elsewhere in California, including along the main streets of Palm Springs.

Jupiter and Saturn tilt ever farther down in the southwest during and after twilight. Look early. Jupiter is the bright one; Saturn is upper left of it.

Jupiter and Saturn will pass just 0.1° from each other at their conjunction on December 21st, low in the sunset. That's about the width of a toothpick at arm's length. The two giants have conjunctions about every 20 years, but this will be their closest one visible in our lifetimes.

The above comes from the Outdoors listings in the Reader compiled by Jerry Schad, author of Afoot & Afield in San Diego County. Schad died in 2011. Planet information from SkyandTelescope.org.

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Premier Red pointsettia. 14-hour-long nights triggers their behavior.
Premier Red pointsettia. 14-hour-long nights triggers their behavior.

Poinsettias, a favorite of backyard gardeners, are now exhibiting their scarlet, petal-like bracts, just in time for the holidays. The onset of 14-hour-long nights triggers their behavior: In San Diego this condition is met just before the date of winter solstice — Monday, December 21.

A walk along the Discovery Center’s bayside illustrates the effect high and low tides have on coastal marshlands.

Exceptionally High and Low Tides are set to occur on several days in mid-December. These tides approximately coincide with the winter solstice — two factors that influence tide-level extremities. On Sunday, December 13, a peak high tide of +7.5 feet occurs at 7:37 a.m. Monday’s high tide of +7.62 peaks at 8:18 a.m. Tuesday’s high tide of +7.51 feet peaks at 9:00 a.m. Wednesday’s high tide of +7.18 feet crests at 9:42 a.m. There are at least two consequences of such high tides. If any strong winter storm happens to arrive from the west during these peak tides, some flooding of low-lying coastal areas around San Diego is likely. On the brighter side, birdwatchers have an opportunity to spot species of rare shorebirds that get pushed to the edges of local bays and coastal marshes by the high water. Several exceptionally low tides will also occur within the same string of mid-December dates. On Sunday, December 13, the tide falls to -1.71 feet at 2:42 p.m. On Monday, the tide drops to -1.89 feet (almost as low as it can possibly go) at 3:28 p.m. On Tuesday, a low tide level of -1.81 feet occurs at 4:14 p.m. On Wednesday, the tides drops to -1.51 feet at 5:00 p.m. (very near the time of sunset). Any of these lowtide occasions are perfect for exploring marine life in the tidepool areas along San Diego County’s coastline.

Sponsored
Sponsored
Washington palm fruit

Ripening Palm Fruit, hanging in great clusters on California’s native fan palms (Washingtonia filifera), can be seen (and tasted) this month. The black, pea-sized fruit consists of a deliciously sweet but almost paper-thin skin surrounding a hard seed. (These are not “California dates” — the fruit of cultivated palms introduced into California’s deserts from northern Africa.) Our native fan palms can be seen in their natural habitat in about two dozen canyons within Anza-Borrego Desert State Park. They have also been planted widely elsewhere in California, including along the main streets of Palm Springs.

Jupiter and Saturn tilt ever farther down in the southwest during and after twilight. Look early. Jupiter is the bright one; Saturn is upper left of it.

Jupiter and Saturn will pass just 0.1° from each other at their conjunction on December 21st, low in the sunset. That's about the width of a toothpick at arm's length. The two giants have conjunctions about every 20 years, but this will be their closest one visible in our lifetimes.

The above comes from the Outdoors listings in the Reader compiled by Jerry Schad, author of Afoot & Afield in San Diego County. Schad died in 2011. Planet information from SkyandTelescope.org.

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4S Ranch Allied Gardens Alpine Baja Balboa Park Bankers Hill Barrio Logan Bay Ho Bay Park Black Mountain Ranch Blossom Valley Bonita Bonsall Borrego Springs Boulevard Campo Cardiff-by-the-Sea Carlsbad Carmel Mountain Carmel Valley Chollas View Chula Vista City College City Heights Clairemont College Area Coronado CSU San Marcos Cuyamaca College Del Cerro Del Mar Descanso Downtown San Diego Eastlake East Village El Cajon Emerald Hills Encanto Encinitas Escondido Fallbrook Fletcher Hills Golden Hill Grant Hill Grantville Grossmont College Guatay Harbor Island Hillcrest Imperial Beach Imperial Valley Jacumba Jamacha-Lomita Jamul Julian Kearny Mesa Kensington La Jolla Lakeside La Mesa Lemon Grove Leucadia Liberty Station Lincoln Acres Lincoln Park Linda Vista Little Italy Logan Heights Mesa College Midway District MiraCosta College Miramar Miramar College Mira Mesa Mission Beach Mission Hills Mission Valley Mountain View Mount Hope Mount Laguna National City Nestor Normal Heights North Park Oak Park Ocean Beach Oceanside Old Town Otay Mesa Pacific Beach Pala Palomar College Palomar Mountain Paradise Hills Pauma Valley Pine Valley Point Loma Point Loma Nazarene Potrero Poway Rainbow Ramona Rancho Bernardo Rancho Penasquitos Rancho San Diego Rancho Santa Fe Rolando San Carlos San Marcos San Onofre Santa Ysabel Santee San Ysidro Scripps Ranch SDSU Serra Mesa Shelltown Shelter Island Sherman Heights Skyline Solana Beach Sorrento Valley Southcrest South Park Southwestern College Spring Valley Stockton Talmadge Temecula Tierrasanta Tijuana UCSD University City University Heights USD Valencia Park Valley Center Vista Warner Springs
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