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Pumpkin-spice season is here, twilight periods are at their shortest
September's new moon and tidal high and lows
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.
Fall Officially Begins at 11:19 am local time on Monday, September 22. It's not just the day that marks the beginning of PST (Pumpkin Spice Time), but also a good excuse to throw an equinox party. At equinox, the sun shines directly down on Earth’s equator. Fall will continue for another three months until the sun “moves” to its farthest southerly point on the winter solstice, December 21.
Equal Days And Nights – The word “equinox” comes from Latin aequus, meaning “equal,” and nox, “night.” On the equinox, day and night are nearly equal in length. 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, more 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 90 minutes; last June, it was about 100 minutes.
Justin Bridle ventured down the cliffs from PLNU to get this colorful shot of the tide pools in La Jolla.
The Highest Tide For September (6.37 feet) is predicted for 8:04 pm on Thursday, September 18th. The month’s lowest tide (-0.62 feet) will occur the same day at 2:14 am. During September the tidal range is typically minimized. Starting in mid-October, extreme negative tides will begin to occur during the afternoon hours (a much more convenient time for exploring tidepools in the low-lying intertidal zone), and not much in the early morning. By December and January, the highest high tides will crest at nearly +7 feet during morning hours, and the lowest low tides will sink to nearly -2 feet during afternoon hours.
September 21 Marks The New Moon. The Waxing Crescent Moon phase begins and runs until the First Quarter Moon on September 29. At around 20 minutes after the time of sunset, look low in the southwestern sky, to the left of where the sun went down, and you will spot the moon’s thin crescent shape. Unlike in the spring season, during which the evening crescent moon “smiles” with upturned cusps, the autumn crescent-moon cusps point well to the left — toward the southern part of the sky.
Here's something you might be interested in.
Pumpkin-spice season is here, twilight periods are at their shortest
September's new moon and tidal high and lows
Pumpkin-spice season is here, twilight periods are at their shortest
September's new moon and tidal high and lows
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.
Fall Officially Begins at 11:19 am local time on Monday, September 22. It's not just the day that marks the beginning of PST (Pumpkin Spice Time), but also a good excuse to throw an equinox party. At equinox, the sun shines directly down on Earth’s equator. Fall will continue for another three months until the sun “moves” to its farthest southerly point on the winter solstice, December 21.
Equal Days And Nights – The word “equinox” comes from Latin aequus, meaning “equal,” and nox, “night.” On the equinox, day and night are nearly equal in length. 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, more 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 90 minutes; last June, it was about 100 minutes.
Justin Bridle ventured down the cliffs from PLNU to get this colorful shot of the tide pools in La Jolla.
The Highest Tide For September (6.37 feet) is predicted for 8:04 pm on Thursday, September 18th. The month’s lowest tide (-0.62 feet) will occur the same day at 2:14 am. During September the tidal range is typically minimized. Starting in mid-October, extreme negative tides will begin to occur during the afternoon hours (a much more convenient time for exploring tidepools in the low-lying intertidal zone), and not much in the early morning. By December and January, the highest high tides will crest at nearly +7 feet during morning hours, and the lowest low tides will sink to nearly -2 feet during afternoon hours.
September 21 Marks The New Moon. The Waxing Crescent Moon phase begins and runs until the First Quarter Moon on September 29. At around 20 minutes after the time of sunset, look low in the southwestern sky, to the left of where the sun went down, and you will spot the moon’s thin crescent shape. Unlike in the spring season, during which the evening crescent moon “smiles” with upturned cusps, the autumn crescent-moon cusps point well to the left — toward the southern part of the sky.
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