Henrik's Calibrated Evening Atlas - fermigas/ltvt GitHub Wiki
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Henrik's "Calibrated Evening Atlas" is a collection of calibrated full disk images taken by Danish pathologist and LTVT co-author Henrik Bondo showing the Moon as it appears in the Earth's evening sky -- with the Sun rising over lunar longitudes from approximately 68°E to 88°W. The website on which Henrik's photos were originally posted ceased existence in January 2009. Most of these have been uploaded to the present Wiki.
Text files that can be used in conjunction with the LTVT [Image Grabber](Image%20Grabber) to automatically download the entire set, including the associated calibration data, for display and analysis with LTVT, may be found on the Calibrated Full Disk Images page; along with similar data for many other calibrated full disk images from a variety of phases, including some of higher resolution and many taken during the period not represented here: between Full and New.
The following thumbnails indicate the scope of Henrik's atlas. The images are listed by the longitude of the Morning Terminator. The number listed is numerically equal to the colongitude when the Moon is between First Quarter and Full (morning terminator = 0 to 90°W). To compute the colongitude for images from New to First Quarter (morning terminator = 90°E to 0°), subtract the listed numeric value from 360°.
(Click on the thumbnails to see the full-sized images stored in the Wiki files area)
| 74° E | 68° E | 68° E | 58° E | 55° E | 43° E |
| [](http://ltvt.wikispaces.com/file/detail/cla_mte74_ap2ba_18apr07_1918ut_3418px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_MTe68_20mar07_1737UT_AP4PM_3275px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/3_mte68_18may07_1958ut_ap2pm_3028px_usm_qu5.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_MTe58_30apr06_1807UT_AP%2B4500%2B13mm_3659px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/v2_mte55_19maj07_2037ut_dob2pm_3500px_qu6.jpg) | [](http://ltvt.wikispaces.com/file/detail/mte43_20maj_2041ut_dob2pm_4303px_qu6.jpg) |
| 42° E | 29° E | 19° E | 13° E | 06° E | 06° E |
| [](http://ltvt.wikispaces.com/file/detail/cla_mte42_22jan07_1801ut_ap2xba_3200px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_mte29_23jan07_1919ut_pm4_3242px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_mte19_24mar07_1807ut_ap4pm_3040px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/mte12951_23apr07_1918ut_ap2ba_galf4_3237px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_mte06_25jan07_1602ut_ap4pm_3113px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/mte06_dob2pm_23maj_2012ut_4099px_qu6.jpg) |
| 05° W | 19° W | 31° W | 42° W | 55° W | 66° W |
| [](http://ltvt.wikispaces.com/file/detail/cla_mtw05_26mar07_1851ut_ap4pm_2967px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_mtw19_27jan07_1912ut_ap4pm_3133px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_mtw31_28mar07_2219ut_ap4pm_3200px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_mtw42_29mar07_1935ut_ap4pm_3200px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_mtw55_30mar07_2058ut_ap4pm_2890px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_mtw66_2jan07_0024ut_ap2ba_3237px_qu9.jpg) |
| 76° W | 76° W | 78° W | 88° W |
| [](http://ltvt.wikispaces.com/file/detail/cla_mtw76_2jan07_2109ut_ap4pm_3093px_qu9.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_2jan07_2109ut_ap130mm_pm4_2200px.jpg) | [](http://ltvt.wikispaces.com/file/detail/_Moon_8feb09_2138-2212UT_AP5%27%27_DMK-terminator%2BNikon-fulldisc.jpg) | [](http://ltvt.wikispaces.com/file/detail/cla_mtw88_23apr05_2009ut_ap4500_3354px_qu7.jpg) |
One of the inspirations for the development of LTVT was the desire for a way to organize and analyze images of the Moon's full disk taken on different dates and times in such a way that they could be used to accurately predict its appearance on past and future dates. A traditional method of doing this is to order the images by colongitude (= 90° minus the longitude of the sub-solar point on the Moon), or, equivalently, by the longitude of the morning (rising) or evening (setting) terminator. Henrik's atlas shows the Moon as it appears in the Earth's evening sky, when the sun is rising over features on the Moon's visible side. The colongitude ranges from about 270° at New Moon to 360° at First Quarter to 90° at Full Moon. During this time, the "morning terminator" moves in synchronism from 90°E to 90°W.
Organization by terminator longitude (or colongitude) has the advantage that for a given value of that parameter, the terminator will always be passing through the same surface features, at least near the Moon's equator. Other possible organizing principles, such as sequencing images by the Moon's "age" in the lunar cycle (number of days since the last Full Moon), or percent illumination, do not have this property.
The primary disadvantage of organizing by terminator longitude is that the Moon will not always have the same visual appearance for a given terminator position with respect to the surface features. This is because the surface features can be displaced to the east or west or to the north or south by the Moon's changing librations (= the longitude and latitude of the sub-observer point on the Moon). LTVT can be used to partially compensate for this by remapping an image from one libration to another.
Another limitation is that the Sun's latitude on the moon varies seasonally from around 1.5°N to 1.5°S. As a consequence of this, although all photos taken at a given terminator longitude will show the terminator passing though the specific surface features at the Moon's equator, the remainder of the terminator can be rotated clockwise or counter-clockwise. 1.5° may sound like a small rotation, but it can significantly alter what features the terminator passes through at high latitudes, and also whether the poles are in sunlit or not. LTVT cannot change what features are depicted in light and shadow, but the latitude of the sub-solar point is included in the calibration process, so the theoretical terminator position in the calibrated photo can be accurately compared to the theoretical position on any past or future date, including the effect of the solar latitude.
Henrik's particular interest is in creating images of the Moon as it would appear to an observer positioned directly over, and moving along with, the terminator. LTVT can easily be used to do this, by loading the images and artificially setting the longitude of the sub-observer point equal to the longitude of the evening terminator.
This page has been edited 3 times. The last modification was made by - 
JimMosher on Mar 6, 2009 4:02 pm