I am trying to extract moonrise and set times from the US Naval Observatory Rest API using the htrr and jsonlite packages. However, I keep getting an error saying, please supply dates in an MM/DD/YYYY format. Which I believe I am, so quite confused.
library(httr)
library(jsonlite)
GET("https://aa.usno.navy.mil/api/rstt/oneday?date=09/20/2005&coords=47.60,-122.33")
The message is confusing, but it seems that we may need to pass in the YYYY-MM-DD format
out <- GET("https://aa.usno.navy.mil/api/rstt/oneday?date=2005-09-20&coords=47.60,-122.33")
-output
out
Response [https://aa.usno.navy.mil/api/rstt/oneday?date=2005-09-20&coords=47.60,-122.33]
Date: 2022-07-24 18:43
Status: 200
Content-Type: application/json
Size: 1.26 kB
{
"apiversion": "3.0.0",
"geometry": {
"coordinates": [
-122.33,
47.6
],
"type": "Point"
},
"properties": {
...
Then, extract the content
library(dplyr)
library(rrapply)
> rrapply(content(out)$properties$data, how = "bind")
closestphase.day closestphase.month closestphase.phase closestphase.time closestphase.year curphase day day_of_week fracillum isdst label
1 18 9 Full Moon 02:01 2005 Waning Gibbous 20 Tuesday 92% FALSE NULL
month moondata.1.phen moondata.1.time moondata.2.phen moondata.2.time moondata.3.phen moondata.3.time sundata.1.phen sundata.1.time
1 9 Rise 02:57 Upper Transit 09:57 Set 17:15 Set 02:13
sundata.2.phen sundata.2.time sundata.3.phen sundata.3.time sundata.4.phen sundata.4.time sundata.5.phen sundata.5.time tz year
1 End Civil Twilight 02:43 Begin Civil Twilight 13:23 Rise 13:54 Upper Transit 20:03 0 2005
By checking the webpage, it is more evident i.e. format specified seems to be incorrect
