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Equal days and nights, Jupiter's closest opposition in 70 years

San Diego's twilight is down to 80 minutes

San Diego Autumn in Cuyamaca
San Diego Autumn in Cuyamaca

Fall Officially Begins at 8:09 pm local time on Wednesday, September 22 — a good excuse to throw an impromptu evening party to celebrate the occasion. At equinox, the sun shines directly on the Earth’s equator. The autumn season will continue for another three months until the sun “moves” to its farthest southerly point, winter solstice, December 21.

Twice a year the sunset lines up perfectly with the water channel at the Salk Institute in La Jolla: on the Fall Equinox and the Summer Equinox.

Equal Days and Nights everywhere on Earth, 12 hours each, are only one noticeable consequence during the time of equinox, either autumnal or vernal (spring). Another consequence is that the sun at equinox always rises from a point on the horizon due east and later sets due west. You could calibrate a compass this way if you had access to a true (unobstructed) horizon. Another, subtle, consequence is that at mid-latitudes like ours, morning and evening twilight periods are shortest during equinox. From San Diego, the duration of twilight this week is about 80 minutes; last June, it was about 100 minutes.

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Jupiter will be at it’s closest opposition in 70 years.

Jupiter — the brilliant, star-like object glowing like a beacon in the eastern sky after nightfall — comes to “opposition” (180° away from the sun) on Monday, September 26. Rising at sunset and setting at sunrise, the giant planet is as close and as bright as it will get this year. In fact, in 2022, Jupiter’s opposition to the sun and closest approach to Earth fall on the same day. That’s because opposition takes place so near in time to Jupiter’s perihelion — on January 21, 2023 — its closest point to the sun in its 12-year orbit. If it’s nearly as close as it gets to the sun, and we go between it and the sun… voila, it’s a close opposition for us! The juxtaposition of Jupiter’s opposition in late 2022 and perihelion in early 2023 brings the planet closer to Earth at this opposition than it has been for 70 years. So, Jupiter will be very bright in our sky!

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.

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San Diego Autumn in Cuyamaca
San Diego Autumn in Cuyamaca

Fall Officially Begins at 8:09 pm local time on Wednesday, September 22 — a good excuse to throw an impromptu evening party to celebrate the occasion. At equinox, the sun shines directly on the Earth’s equator. The autumn season will continue for another three months until the sun “moves” to its farthest southerly point, winter solstice, December 21.

Twice a year the sunset lines up perfectly with the water channel at the Salk Institute in La Jolla: on the Fall Equinox and the Summer Equinox.

Equal Days and Nights everywhere on Earth, 12 hours each, are only one noticeable consequence during the time of equinox, either autumnal or vernal (spring). Another consequence is that the sun at equinox always rises from a point on the horizon due east and later sets due west. You could calibrate a compass this way if you had access to a true (unobstructed) horizon. Another, subtle, consequence is that at mid-latitudes like ours, morning and evening twilight periods are shortest during equinox. From San Diego, the duration of twilight this week is about 80 minutes; last June, it was about 100 minutes.

Sponsored
Sponsored
Jupiter will be at it’s closest opposition in 70 years.

Jupiter — the brilliant, star-like object glowing like a beacon in the eastern sky after nightfall — comes to “opposition” (180° away from the sun) on Monday, September 26. Rising at sunset and setting at sunrise, the giant planet is as close and as bright as it will get this year. In fact, in 2022, Jupiter’s opposition to the sun and closest approach to Earth fall on the same day. That’s because opposition takes place so near in time to Jupiter’s perihelion — on January 21, 2023 — its closest point to the sun in its 12-year orbit. If it’s nearly as close as it gets to the sun, and we go between it and the sun… voila, it’s a close opposition for us! The juxtaposition of Jupiter’s opposition in late 2022 and perihelion in early 2023 brings the planet closer to Earth at this opposition than it has been for 70 years. So, Jupiter will be very bright in our sky!

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.

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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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