Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies.
We do not use cookies of this type.
Marketing cookies are used to track visitors across websites. The intention is to display ads that are relevant and engaging for the individual user and thereby more valuable for publishers and third party advertisers.
We do not use cookies of this type.
Analytics cookies help website owners to understand how visitors interact with websites by collecting and reporting information anonymously.
We do not use cookies of this type.
Preference cookies enable a website to remember information that changes the way the website behaves or looks, like your preferred language or the region that you are in.
We do not use cookies of this type.
Unclassified cookies are cookies that we are in the process of classifying, together with the providers of individual cookies.
We do not use cookies of this type.
Hi
Jacques Laskar, head of IMCCE/Paris Observatory, calculated the distance Earth-Mars on 25 August 1719 and found 0.37401 ua (https://perso.imcce.fr/jacques-laskar/en/general-audience/minimal-distance-earth-mars/). Using Uruk_One, it is possible to test its accuracy :
Geocentric ecliptical coordinates – True Equinox of Date = 0.374012. Same result…
Regards.
An interesting occasion for testing the difference between DE438 and DE440. Iterating with a resolution of 1 minute I get:
De438 : least apparent distance Earth-Mars at 19:54 TDT = 0.374 009 667 497 AU
De440 : least apparent distance Earth-Mars at 19:54 TDT = 0.374 009 676 308 AU
translated into Kilometers it means a difference of 1.3 Km, due to the new positions obtained by the probes currently orbiting around Mars.
Now that DE1 terminal is implemented it’s more comfortable to find the minimum of a function like Δ, going back and forth with the Time Change buttons.
On 25 August 1719 the least distance Earth-Mars results:
0.374 009 676 045 AU at 19:51:13 TDT ±5s. (DE440)