moontracker: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/moontracker - from package: predict

You may install the required package with command apt-get install {package}

Error in other languages:
moontracker: bevel nie gevind nie
moontracker: comandă negăsită
moontracker: comando não encontrado
moontracker: commande introuvable
moontracker: command not found
moontracker: käsku ei ole
moontracker: không tìm thấy lệnh
moontracker: komanda nerasta
moontracker: Kommando nicht gefunden.
moontracker: kommandot finns inte
moontracker: komut yok
moontracker: nie znaleziono polecenia
moontracker: níor aimsíodh an t-ordú
moontracker: no se encontró la orden
moontracker: no s'ha trobat l'ordre
moontracker: opdracht niet gevonden
moontracker: parancs nem található
moontracker: perintah tidak ditemukan
moontracker: príkaz nenájdený
moontracker: příkaz nenalezen
moontracker: команда не найдена
moontracker: командата не е открита
moontracker: 命令找不到
moontracker: コマンドが見つかりません