Home / Science / Harvest Moon 2019: When and how will the & # 39; Micro & # 39; moon be seen in September?

Harvest Moon 2019: When and how will the & # 39; Micro & # 39; moon be seen in September?

In this photograph of NASA photographer Debbie McCallum, Harvest Moon 201

7 rises above NASA's Goddard Space Flight Center in Greenbelt, Maryland.

[Picture credits: Debbie McCallum / NASA]

The Full Moon of September 2019 also bears the title of the harvesting moon for the inhabitants of the northern hemisphere.

It will also be the smallest full moon of 2019. But depending on which time zone you live in, the moon officially becomes full either on the evening of the 13th or the early morning of the 14th Saturday.

Related: Spooky "Honey Moon" lights on Friday the 13th. (Photos)

Full Moon for different locations on different nights.

The moon officially becomes full when it reaches this point the sky where the moon is directly opposite the sun (180 degrees away from it) in heavenly length, a near-perfect alignment that astronomers call "syzygy". This moment will occur on Saturday at 4:33 GMT. If you live in the eastern time zone, this is 12:33 on Saturday.

For the rest of the US, however, the moon will be full before midnight. For example, for Chicago this happens at 23:33. Central time on Friday the 13th In San Francisco, the moon is full at 21:33. Pacific Pacific on the same Friday.

Although the Easterners' Full Moon date is September 14, the moon will be "fuller" on Friday night as the full-phase moment is only a few hours away – unlike Saturday night, when the moon is almost one will be all day after its highest fullness. In fact, on Saturday it will not be full at all; it will actually be a waning moon although, as we will explain later, it will probably still look full to most people.

Harvesting in the light of the moon

In this photo by Stuart McNair, the rising Harvest Moon lights the farmland at sunset on September 15, 2016 in the north of Toronto, Canada.

(Photo credits: Stuart McNair)

Since the full moon this month is the closest to the September equinox we call it the harvest moon. Usually we associate the harvest moon with September, although this is not always the case. Sometimes, when the full moon occurs in the first week of September, we have to wait until October for the harvest moon. Between 1970 and 2050 there are 18 years in which the Harvest Moon appears in October. The last time was in 2017 and the next time in 2020. The harvest month in October is on average three years apart, although the time frame can be very different and there may be situations in which this is the case how eight years can pass (the next example will be between 2020 and 2028).

Many think Harvest Moon stays longer in the night sky than any other full moon we see in the year, but that's not true. What distinguishes this month's full moon from the others is that at the height of the current harvest season, farmers can work in the moonlight until late at night. Thus, the moon hangs in the sky several days before and after the full moon like a large, luminous lantern and extends the light far after sunset. It starts at about the time the sun goes down, but more importantly, at this time of the year, rather than ascending 50 minutes later on average every day, the moon appears to rise almost every night at the same time.

Below are some examples of 10 North American cities.

Time at moonrise

Location 12. September 13. September 14. September
Albuquerque, NM 18:58 hrs MDT 19:28 hrs MDT 19:57 hrs MDT
Chicago, IL 18:51 CDT 19:18 Watch CDT 19:43 CDT
Denver, CO 18:58. MDT 19:26 MDT 19:52 MDT
Edmonton, AB 20:01 MDT 20:18 MDT 20:35 MDT
Houston, TX 19:05 CDT 19:38 CDT 20:09 CDT
Los Angeles, CA 18:45 PDT 19:15 PDT 19:44 PDT
Miami, FL 18:59 EDT 19:33 EDT 20:05 EDT
Montreal, QC 19:01 EDT 19:25 EDT 19:48 EDT
New York, NY 18:53 EDT 19:21 EDT 19:46 EDT
Seattle, WA 19:23 PDT 19:46 PDT 20:07 PDT

In fact, moonrise over this three-night period comes to an average of less than 27 for our relatively small sample Minutes later per night. A quick look at the table shows that the night-to-night difference is greatest for the more southerly locations (in Miami, near 26 degrees north latitude, moonrise comes on average 33 minutes later). In the meantime, the difference in northern locations is lower (in Edmonton, Alberta, at 53.6 degrees north latitude, the average difference is only 17 minutes).

The reason for this seasonal circumstance is that the moon appears to be moving along the ecliptic – the apparent pathway that follows the sun, moon, and planets across the sky – and at this time of year, when they rise. The ecliptic forms the smallest angle to the horizon for the inhabitants of the northern hemisphere.

In contrast, the ecliptic for the inhabitants of the southern hemisphere at this time of year seems to be almost vertical (almost at right angles) to the eastern horizon. Therefore, the difference for the time of moonrise exceeds the average of 50 minutes per night. In Sydney, for example, the difference from night to night is 55 minutes.

Small … and slow

Because the Harvest Moon arrives at its extreme peak in about 14.5 hours (its furthest distance from Earth) before full phase – when it reaches 406,377 kilometers from Earth – it is also the smallest full-moon in this year's size: a "micro" moon in the vernacular.

In fact, it is about 14 percent smaller than the perigee "Supermoon" of February 19 . If it were somehow possible to put both full moons side by side in the sky, the difference in size would be easy to see. But for most, our September Harvest Moon will not look much different from the others that have appeared so far this year.

On average, the moon is 385,000 kilometers from Earth. In perigee, this distance is about 350,000 km, while in apogee it is about 406,000 km. These images of the moon by Robert Vanderbei were taken with the same equipment: when the moon is near, it appears larger than when it is farther away. A full moon on the perigee is referred to as Supermoon (right, taken on August 9, 2014), on Apogee as Minimoon (left, taken on February 3, 2015).

As the Moon is farthest from Earth in its orbit, it moves the slowest. Therefore, note how long the disc appears perfectly round before and after the full moon. This interval is always the longest around the Apogee, where on three consecutive nights you can see a pretty round disk, especially when – as in the eastern United States – the full moon occurs around midnight. For the occasional sky watcher, it will therefore look like the moon will be "full" for three consecutive nights! The defect of the illumination on the lunar disc – this dark band near the edge – will be very low on the nights of Thursday, September 12 and Saturday, September 14.

And one last thought: By mid-December The daily delay at moonrise will have risen to an hour or more, but at the moment it is less than half of it.

Maybe Shakespeare's Julia meant that with "the fickle moon".

Editor's Note: If you would like to take a stunning photo of the Harvest Moon that you would like to share for a possible story or image gallery, please contact the managing editor Tariq Malik at spacephotos @space .com .

Joe Rao is a lecturer and guest lecturer at the New York Hayden Planetarium . He writes about astronomy for Natural History Magazine the Farmers & # 39; Almanac and other publications and is a meteorologist in front of the camera for Verizon FiOS1 News in New York's Lower Hudson Valley. Follow us on Twitter @SpaceTotcom and Facebook .

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