![]() The spring (or vernal) equinox will happen in the Northern Hemisphere next year on Monday, March 20. When can we expect peak fall colors? Here's a look for Greater Cincinnati □ When is the spring equinox in 2023? Greater Cincinnati will begin to see minimal change in leaf colors in the beginning of October and past peak colors by the beginning of November. currently either sees no change in leaf color, or minimal to patchy change, mainly in the Northern states bordering Canada. When is the best time to see fall foliage?Īccording to the 2022 fall foliage prediction map from, much of the U.S. 22, according to the Old Farmer's Almanac. The Earth’s axis of rotation is tilted by around 23.4 degrees relative to its orbit around the Sun. ![]() The solstices (and the equinoxes) are the result of Earth’s tilt and its orbit around the Sun. The fall equinox happens around the Northern Hemisphere at exactly the same time: 9:04 p.m. The summer solstice is when the Sun reaches its highest point in the sky, and here in the northern hemisphere, that results in the longest day of the year. The word “equinox” comes from Latin aequus, meaning “equal,” and nox, “night.” On the autumnal (and again during the spring) equinox, day and night are roughly equal in length. As the fall equinox approaches, the Southern Hemisphere prepares for spring and longer days, and moves into summer as the Northern Hemisphere moves into winter. Seasons are opposite in the Southern Hemisphere. The word 'equinox' comes from the Latin word aequus, which means 'equal,' and nox, which means 'night,' according to the Farmer’s Almanac. At the summer solstice, the Sun travels the longest path through the sky, and that day therefore has the most daylight. The two solstices in a year are: Winter solstice on December 22. On the other hand, the solstice refers to a day with either the longest day or the shortest. We have two equinoxes in a year which are: Spring equinox on March 21. From the Latin words for 'sun' and 'to stop' comes our word 'solstice.' On solstice, the sun does appear to pause in the sky when it reaches its northernmost point, which occurred at 1:04 a.m. summer solstice, the two moments during the year when the path of the Sun in the sky is farthest north in the Northern Hemisphere (June 20 or 21) or farthest south in the Southern Hemisphere (December 21 or 22). Equinox refers to a day with an equal duration of day and night. 22 this year.Īccording to the National Weather Service, as the Earth revolves around the sun, it "gets positioned such that the sun is directly over the equator. Basically, the sun's energy is in balance between the Northern and Southern hemispheres." Summer solstice marks a period of celebration, a time-honored tradition worldwide. The Earth is at the autumnal, or fall, equinox on Sept. Near the summer solstice, which typically occurs around June 21, the Northern Hemisphere is in a more direct path of the sun's energy, producing long days and shorter nights. Seasons are caused by the Earth's tilt and rotation, which is on an average 23.5-degree tilted axis.Īs the Earth orbits elliptically around the sun, it is at its closest point in January and the farthest in July. Has fall already started? That depends on whom you ask What happens during the autumn equinox? Meteorological fall already began earlier in the month, on Sept. Daylight hours will continue to get shorter through the season, culminating with the shortest day of the year during the winter solstice in December. 22 marks the arrival of of the autumn equinox and begins the start of the astronomical fall season in the Northern Hemisphere. It may not feel like it yet, but fall is on the way. This model was named the ‘Hutton Criteria,’ and was launched as AHDB’s new national warning system for late blight in GB in 2017. Ultimately, t he best prediction outcome was a model that requires two consecutive days with a minimum temperature of 10☌ and at least 6 hours each day with a relative humidity ≥90%. These findings were used to develop candidate replacement models for the Smith Period. The results showed significant levels of infection under drier (less humid) conditions than prescribed by the Smith Period. The word equinox is derived from two Latin words - aequus (equal) and nox (night). These events are referred to as Equinoxes. The Smith Period is a set of temperature and humidity criteria that was developed in the 1950’s and h ad not been reviewed or modified since its inception.Ĭontrolled environment experiments were used to refine the temperature and humidity criteria that define risk of infection, using contemporary late blight isolates. There are only two times of the year when the Earth's axis is tilted neither toward nor away from the sun, resulting in a 'nearly' equal amount of daylight and darkness at all latitudes. Data on late blight outbreaks (obtained through AHD B’s Fight Against Blight activity) w ere used to test the performance of the Smith Period in forecast ing late blight disease outbreaks.
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